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bag of waters

a fluid-filled membranous sac in the pregnant uterus that encloses and cushions the fetus, normally breaking at or just before the time of birth; the amnion.
Origin of bag of waters
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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bag-of-waters in Medicine

bag of waters n.
the amniotic sac and the amniotic fluid in it

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