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

ethmoidal vein

ethmoidal vein in Medicine

ethmoidal vein n.
Any of the veins that drain the ethmoidal sinuses and pass into the superior ophthalmic vein.

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