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

ball-valve thrombus

ball-valve thrombus in Medicine

ball-valve thrombus n.
A ball thrombus intermittently occluding the mitral orifice.

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