What is the X in X-mas?

a-v extrasystole

a-v extrasystole in Medicine

A-V extrasystole n.
See atrioventricular extrasystole.

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