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hourglass contraction

hourglass contraction in Medicine

hourglass contraction hour·glass contraction (our'glās')
n.
Constriction of the middle portion of a hollow organ, such as the stomach or the uterus.

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