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.
Blood in semen (called hematospermia, because sperm are mixed with blood in the semen) can be a frightening symptom, but it is usually not a sign of a serious problem. Blood in semen is not usually a sign of cancer and does not affect sexual function. Semen is composed of sperm from the epididymis and fluids from the seminal vesicles, prostate, and small mucous glands that provide fluids to nourish sperm. Thus, blood could come from injury to any of these structures.