What do a.m. and p.m. stand for?

sigmoid vein

sigmoid vein in Medicine

sigmoid vein n.
Any of the tributaries of the inferior mesenteric vein that drain the sigmoid colon.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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