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.
Figure 1. A, Sessile serrated adenoma/polyp (SSA/P) showing abnormal dilation with inverted T- or L-shaped crypts. B, SSA/P with low-grade. cytologic dysplasia with abnormal dilation, nuclear pseudostratification, and hyperchromasia (upper portion of the specimen).