A-Z list of medicines R

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  • r   noun the 18th letter of the Roman alphabet* ; the length of a line segment between the center and circumference of a circle or sphere* ; (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole* ; a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
  • rabbit   noun any of various burrowing animals of the family Leporidae having long ears and short tails; some domesticated and raised for pets or food* ; flesh of any of various rabbits or hares (wild or domesticated) eaten as food* ; the fur of a rabbit* ; verb hunt rabbits
  • rabbit bush   noun pleasantly aromatic shrub having erect slender flexible hairy branches and dense clusters of small yellow flowers covering vast areas of western alkali plains and affording a retreat for jackrabbits; source of a yellow dye used by the Navajo
  • radiance   noun the quality of being bright and sending out rays of light* ; the amount of electromagnetic radiation leaving or arriving at a point on a surface* ; an attractive combination of good health and happiness
  • radiation   noun the act of spreading outward from a central source* ;a radial arrangement of nerve fibers connecting different parts of the brain* ; the spread of a group of organisms into new habitats* ; energy that is radiated or transmitted in the form of rays or waves or particles* ; the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay* ; (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance* ;syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours
  • radish   noun pungent fleshy edible root* ; Eurasian plant widely cultivated for its edible pungent root usually eaten raw* ; pungent edible root of any of various cultivated radish plants* ; radish of Japan with a long hard durable root eaten raw or cooked* ; a cruciferous plant of the genus Raphanus having a pungent edible root
  • radix   noun (numeration system) the positive integer that is equivalent to one in the next higher counting place
  • rage   noun violent state of the elements* ; a state of extreme anger* ;something that is desired intensely* ; an interest followed with exaggerated zeal* ; a feeling of intense anger* ; verb feel intense anger* ; be violent; as of fires and storms* ; behave violently, as if in state of a great anger
  • ranitidine   noun a histamine blocker and antacid (trade name Zantac) used to treat peptic ulcers and gastritis and esophageal reflux
  • ranunculus bulbosus   noun perennial Old World buttercup with golden to sulphur yellow flowers in late spring to early summer; naturalized in North America
  • raphanus sativus   noun Eurasian plant widely cultivated for its edible pungent root usually eaten raw
  • raspberry   noun red or black edible aggregate berries usually smaller than the related blackberries* ; woody brambles bearing usually red but sometimes black or yellow fruits that separate from the receptacle when ripe and are rounder and smaller than blackberries* ; a cry or noise made to express displeasure or contempt
  • rauwolfia serpentina   noun East Indian climbing shrub with twisted limbs and roots resembling serpents
  • react   verb undergo a chemical reaction; react with another substance under certain conditions* ; show a response or a reaction to something* ; act against or in opposition to
  • real   adj. capable of being treated as fact* ; being or occurring in fact or actuality; having verified existence; not illusory* ; no less than what is stated; worthy of the name* ; being value measured in terms of purchasing power* ; not to be taken lightly* ; (of property) fixed or immovable* ; having substance or capable of being treated as fact; not imaginary* ; coinciding with reality* ; being or reflecting the essential or genuine character of something* ; adv. used as intensifiers; `real' is sometimes used informally for `really'; `rattling' is informal* ; noun an old small silver Spanish coin* ; any rational or irrational number
  • recapture   noun the act of taking something back* ; a legal seizure by the government of profits beyond a fixed amount* ; verb capture again* ; take up anew* ; experience anew* ; take back by force, as after a battle
  • recovery   noun the act of regaining or saving something lost (or in danger of becoming lost)* ; return to an original state* ; gradual healing (through rest) after sickness or injury
  • red   adj. red with or characterized by blood* ; of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies* ; characterized by violence or bloodshed* ; (especially of the face) reddened or suffused with or as if with blood from emotion or exertion* ; noun red color or pigment; the chromatic color resembling the hue of blood* ; a tributary of the Mississippi River that flows eastward from Texas along the southern boundary of Oklahoma and through Louisiana* ; emotionally charged terms used to refer to extreme radicals or revolutionaries* ; the amount by which the cost of a business exceeds its revenue
  • red alder   noun large tree of Pacific coast of North America having hard red wood much used for furniture
  • red cedar   noun fragrant reddish wood of any of various red cedar trees* ; tall tree of the Pacific coast of North America having foliage like cypress and cinnamon red bark* ; small juniper found east of Rocky Mountains having a conic crown, brown bark that peels in shreds, and small sharp needles* ; large valuable arborvitae of northwestern United States
  • red clover   noun erect to decumbent short lived perennial having red purple to pink flowers; the most commonly grown forage clover
  • red hot   adj. glowing red with heat* ; characterized by intense emotion or interest or excitement* ; very fast; capable of quick response and great speed* ; newest or most recent* ; having strong sexual appeal
  • red maple   noun maple of eastern and central America; five lobed leaves turn scarlet and yellow in autumn
  • red mulberry   noun North American mulberry having dark purple edible fruit
  • red oak   noun any of numerous American oaks having 4 stamens in each floret, acorns requiring two years to mature and leaf veins usually extending beyond the leaf margin to form points or bristles
  • red pepper   noun very hot red peppers; usually long and thin; some very small* ; ground pods and seeds of pungent red peppers of the genus Capsicum
  • red pine   noun pine of eastern North America having long needles in bunches of two and reddish bark* ; tall New Zealand timber tree
  • red raspberry   noun any of several raspberries bearing red fruit
  • red snapper   noun an esteemed food fish with pinkish red head and body; common in the Atlantic coastal waters of North America and the Gulf of Mexico* ; highly esteemed reddish lean flesh of snapper from Atlantic coast and Gulf of Mexico
  • redeem   verb convert into cash; of commercial papers* ; pay off (loans or promissory notes)* ; to turn in (vouchers or coupons) and receive something in exchange* ; restore the honor or worth of* ;exchange or buy back for money; under threat* ; save from sins
  • redroot   noun perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant
  • reed canary grass   noun perennial grass of marshy meadows and ditches having broad leaves; Europe and North America
  • refill   noun a commercial product that refills a container with its appropriate contents* ; a prescription drug that is provided again* ; verbfill something that had previously been emptied
  • refine   verb make more precise or increase the discriminatory powers of* ; attenuate or reduce in vigor, strength, or validity by polishing or purifying* ; reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities* ; treat or prepare so as to put in a usable condition* ; make more complex, intricate, or richer* ; improve or perfect by pruning or polishing
  • reflux   noun an abnormal backward flow of body fluids* ; the outward flow of the tide
  • reform   noun a change for the better as a result of correcting abuses* ; self improvement in behavior or morals by abandoning some vice* ; a campaign aimed to correct abuses or malpractices* ;verb change for the better* ; make changes for improvement in order to remove abuse and injustices* ; improve by alteration or correction of errors or defects and put into a better condition* ; break up the molecules of* ; produce by cracking* ; bring, lead, or force to abandon a wrong or evil course of life, conduct, and adopt a right one
  • refresher   noun a drink that refreshes* ; a fee (in addition to that marked on the brief) paid to counsel in a case that lasts more than one day* ; a course that reviews and updates a topic for those who have not kept abreast of developments
  • regimen   noun (medicine) a systematic plan for therapy (often including diet)
  • regular   adj. in accord with regular practice or procedure* ; relating to a person who does something regularly* ; officially full time* ; not deviating from what is normal* ; in accordance with fixed order or procedure or principle* ; (of solids) having clear dimensions that can be measured; volume can be determined with a suitable geometric formula* ; (used of the military) belonging to or engaged in by legitimate army forces* ; conforming to a standard or pattern* ;regularly scheduled for fixed times* ; often used as intensifiers* ; not constipated* ; occurring at fixed intervals* ; symmetrically arranged* ;noun a garment size for persons of average height and weight* ; a regular patron* ; a dependable follower (especially in party politics)* ; a soldier in the regular army
  • rejuvenation   noun the act of restoring to a more youthful condition* ; the phenomenon of vitality and freshness being restored
  • relax   verb cause to feel relaxed* ; become less tense, rest, or take one's ease* ; make less tight* ; become less severe or strict* ; make less severe or strict* ; become less tense, less formal, or less restrained, and assume a friendlier manner* ; become loose or looser or less tight* ; make less active or fast
  • relief   noun the act of freeing a city or town that has been besieged* ;aid for the aged or indigent or handicapped* ; assistance in time of difficulty* ; sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background* ; the feeling that comes when something burdensome is removed or reduced* ; (law) redress awarded by a court* ; the condition of being comfortable or relieved (especially after being relieved of distress)* ; the act of reducing something unpleasant (as pain or annoyance)* ; a change for the better* ; someone who takes the place of another (as when things get dangerous or difficult)* ; a pause for relaxation
  • reliever   noun a pitcher who does not start the game* ; a person who reduces the intensity (e.g., of fears) and calms and pacifies* ;someone who takes the place of another (as when things get dangerous or difficult)
  • remicade   noun an anti TNF compound (trade name Remicade) consisting of an antibody directed against TNF; it is given intravenously at one month to three month intervals; used in treatment of regional enteritis and rheumatoid arthritis
  • renewal   noun the act of renewing* ; the conversion of wasteland into land suitable for use of habitation or cultivation* ; filling again by supplying what has been used up
  • repair   noun the act of putting something in working order again* ; a formal way of referring to the condition of something* ; a frequently visited place* ; verb restore by replacing a part or putting together what is torn or broken* ; move, travel, or proceed toward some place* ;give new life or energy to* ; set straight or right* ; make amends for; pay compensation for
  • rescriptor   noun a non nucleoside reverse transcriptase inhibitor (trade name Rescriptor) used to treat AIDS and HIV
  • rescue   noun recovery or preservation from loss or danger* ; verbtake forcibly from legal custody* ; free from harm or evil
  • reserved   adj. cool and formal in manner* ; marked by self restraint and reticence* ; set aside for the use of a particular person or party
  • rest   noun freedom from activity (work or strain or responsibility)* ; a support on which things can be put* ; a musical notation indicating a silence of a specified duration* ; euphemisms for death (based on an analogy between lying in a bed and in a tomb)* ; a state of inaction* ;something left after other parts have been taken away* ; a pause for relaxation* ; verb be at rest* ; take a short break from one's activities in order to relax* ; give a rest to* ; not move; be in a resting position* ; put something in a resting position, as for support or steadying* ; be inactive, refrain from acting* ; be inherent or innate in* ; stay the same; remain in a certain state* ; rest on or as if on a pillow* ; sit, as on a branch* ; have a place in relation to something else
  • restore   verb give or bring back* ; bring back into original existence, use, function, or position* ; return to its original or usable and functioning condition* ; return to life; get or give new life or energy* ;restore by replacing a part or putting together what is torn or broken
  • restoril   noun a frequently prescribed benzodiazepine (trade name Restoril); takes effect slowly and lasts long enough to help those people who wake up frequently during the night
  • retrovir   noun an antiviral drug (trade name Retrovir) used in the treatment of AIDS; adverse side effects include liver damage and suppression of the bone marrow
  • rheumatism   noun any painful disorder of the joints or muscles or connective tissues* ; a chronic autoimmune disease with inflammation of the joints and marked deformities; something (possibly a virus) triggers an attack on the synovium by the immune system, which releases cytokines that stimulate an inflammatory reaction that can lead to the destruction of all components of the joint
  • rhizopus   noun any of various rot causing fungi of the genus Rhizopus
  • rhizopus stolonifer   noun fungus causing soft watery rot in fruits and vegetables and rings of dry rot around roots of sweet potatoes
  • rhubarb   noun plants having long green or reddish acidic leafstalks growing in basal clumps; stems (and only the stems) are edible when cooked; leaves are poisonous* ; long pinkish sour leafstalks usually eaten cooked and sweetened
  • ribavirin   noun an inhaled antiviral agent (trade name Virazole) that may be used to treat serious virus infections
  • rice   noun grains used as food either unpolished or more often polished* ; United States playwright (1892 1967)* ; English lyricist who frequently worked with Andrew Lloyd Webber (born in 1944)* ; annual or perennial rhizomatous marsh grasses; seed used for food; straw used for paper* ; verb sieve so that it becomes the consistency of rice
  • ricinus communis   noun large shrub of tropical Africa and Asia having large palmate leaves and spiny capsules containing seeds that are the source of castor oil and ricin; widely naturalized throughout the tropics
  • rifadin   noun an antibacterial drug (trade names Rifadin and Rimactane) used to treat tuberculosis
  • rifampin   noun an antibacterial drug (trade names Rifadin and Rimactane) used to treat tuberculosis
  • ringworm   noun infections of the skin or nails caused by fungi and appearing as itching circular patches
  • rinse   noun washing lightly without soap* ; the act of giving a light tint to the hair* ; the removal of soap with clean water in the final stage of washing* ; a liquid preparation used on wet hair to give it a tint* ; verbwash off soap or remaining dirt* ; rinse one's mouth and throat with mouthwash* ; clean with some chemical process
  • ritalin   noun central nervous system stimulant (trade name Ritalin) used in the treatment of narcolepsy in adults and attention deficit disorder in children
  • river   noun a large natural stream of water (larger than a creek)
  • robaxin   noun muscle relaxant for skeletal muscles (trade name Robaxin) used to treat spasms
  • robinia pseudoacacia   noun large thorny tree of eastern and central United States having pinnately compound leaves and drooping racemes of white flowers; widely naturalized in many varieties in temperate regions
  • roman   adj. of or relating to or derived from Rome (especially ancient Rome)* ; relating to or characteristic of people of Rome* ; of or relating to or supporting Romanism* ; characteristic of the modern type that most directly represents the type used in ancient Roman inscriptions* ; noun a typeface used in ancient Roman inscriptions* ; a resident of modern Rome* ; an inhabitant of the ancient Roman Empire
  • rosa canina   noun prickly wild rose with delicate pink or white scentless flowers; native to Europe
  • rosa damascena   noun large hardy very fragrant pink rose; cultivated in Asia Minor as source of attar of roses; parent of many hybrids
  • rosacea   noun a skin disease of adults (more often women) in which blood vessels of the face enlarge resulting in a flushed appearance
  • rose quartz   noun a translucent rose red variety of quartz used for ornaments
  • rosmarinus officinalis   noun widely cultivated for its fragrant grey green leaves used in cooking and in perfumery
  • rough   adj. not perfected* ; (of persons or behavior) lacking refinement or finesse* ; having or caused by an irregular surface* ;causing or characterized by jolts and irregular movements* ; of the margin of a leaf shape; having the edge cut or fringed or scalloped* ;ready and able to resort to force or violence* ; unpleasantly harsh or grating in sound* ; violently agitated and turbulent* ; not shaped by cutting or trimming* ; full of hardship or trials* ; not quite exact or correct* ; unkind or cruel or uncivil* ; unpleasantly stern* ; not carefully or expertly made* ; adv. with rough motion as over a rough surface* ; with roughness or violence (`rough' is an informal variant for `roughly')* ;noun the part of a golf course bordering the fairway where the grass is not cut short* ; verb prepare in preliminary or sketchy form
  • rough dry   verb dry without smoothing or ironing
  • rubbing   noun representation consisting of a copy (as of an engraving) made by laying paper over something and rubbing it with charcoal* ; effort expended in moving one object over another with pressure* ; the resistance encountered when one body is moved in contact with another
  • rubbing alcohol   noun lotion consisting of a poisonous solution of isopropyl alcohol or denatured ethanol alcohol for external use
  • rubia tinctorum   noun Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin
  • rubus   noun large genus of brambles bearing berries
  • rugby   noun a form of football played with an oval ball
  • rumex acetosa   noun European sorrel with large slightly acidic sagittate leaves grown throughout north temperate zone for salad and spring greens
  • rumex obtusifolius   noun European dock with broad obtuse leaves and bitter rootstock common as a weed in North America
  • russian olive   noun deciduous shrubby tree of Europe and western Asia having grey leaves and small yellow fruits covered in silvery scales; sometimes spiny
  • russian thistle   noun prickly bushy Eurasian plant; a troublesome weed in central and western United States
  • rust   adj. of the brown color of rust* ; noun any of various fungi causing rust disease in plants* ; the formation of reddish brown ferric oxides on iron by low temperature oxidation in the presence of water* ; a reddish brown discoloration of leaves and stems caused by a rust fungus* ; a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture* ; verb become coated with oxide* ; become destroyed by water, air, or an etching chemical such as an acid* ; cause to deteriorate due to the action of water, air, or an acid
  • ruta graveolens   noun European strong scented perennial herb with grey green bitter tasting leaves; an irritant similar to poison ivy
  • rye   noun whiskey distilled from rye or rye and malt* ; hardy annual cereal grass widely cultivated in northern Europe where its grain is the chief ingredient of black bread and in North America for forage and soil improvement* ; the seed of the cereal grass
  • rye grass   noun any of several annual or perennial Eurasian grasses
  • ryegrass   noun any of several annual or perennial Eurasian grasses

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