(kleft) [Icel., kluft, a cleft]. Divided. A fissure. C, Branchial. See C, Visceral. * C.-hand, a congenital deformity in which some finger or fingers are widely separated from the others. C. Palate, a congenital fissure of the palate. C. Sternum, con- genital fissure of the sternum. C, Visceral, the four slit-like openings on each side in the cervical region in the fetus, sometimes called the branchial openings. The slits close (in the human fetus), except the upper, from which are developed the auditory meatus, tympanic cavity, and eustachian tube.