Sessility (medicine)

In medicine, sessility is a characteristic of tumors and polyps that lack a stalk, as opposed to those that are pedunculated.

Literarily, sessile means something floating. In medical study it is used commonly to mean any structure very closely attached or related to another similar or different structure. Examples may be a very tiny bone 'floating' on another bone in case of Pisiform bone on the triquetrum among the carpal bones, like a sessile polyp, which is flat and not connected with a stalk but 'floating' over the GIT mucous membranes.