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

muscle spasm

muscle spasm in Medicine

muscle spasm n.
Persistent increased tension and shortness in a muscle or group of muscles that cannot be released voluntarily.

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