amniotic sac

Cultural Dictionary

amniotic sac definition


A two-layered membrane that surrounds the embryo or fetus in the uterus. The amniotic sac is filled with fluid in which the embryo or fetus is suspended. (See reproductive systems.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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