snub. (mining engineering). To increase the height of an undercut by means of explosives or otherwise. To check the descent of a car by the turn of a rope around a post.
Sessile polyps simply mean that the mass is flat and does not have a stalk. The other types of colonic polyps are pedunculated- these are not flat but attached to a stalk. Since a sessile colonic polyp does not have a stalk, it is usually found very close to the colonic wall lining.
In terms of shape, colon polyps come in two basic varieties: pedunculated and sessile. Pedunculated polyps are mushroom-like tissue growths that are attached to the surface of the mucous membrane by a long, thin stalk, or peduncle. Sessile polyps sit right on the surface of the mucous membrane.