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.
The tissue covering a polyp may look the same as normal colon tissue, or, there may be tissue changes ranging from subtle color changes to ulceration and bleeding. Some polyps are flat (sessile) and others extend out on a stalk (pedunculated). Colonoscopy is the best test for the follow-up examination of polyps.