hourglass contraction

hourglass contraction definition - medical

hour·glass contraction (ourˈglăsˌ)

noun
Constriction of the middle portion of a hollow organ, such as the stomach or the uterus.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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