Collins
World English Dictionary
amniotic fluid
 
n
the fluid surrounding the fetus in the womb

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

amniotic fluid n.
The fluid within the amnion that surrounds the fetus and protects it from injury.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
amniotic fluid   (ām'nē-ŏt'ĭk)  Pronunciation Key 
The watery fluid within the amnion that surrounds the fetus. Amniotic fluid cushions the fetus from injury, allows movement, and helps to stabilize temperature. The composition of the fluid changes over the course of gestation. Initially, amniotic fluid is similar to maternal plasma. As the fetus develops, phospholipids originating from the lungs, fetal cells, lanugo, and urine are deposited in the fluid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
amniotic fluid [(am-nee-ot-ik)]

The fluid, resembling salt water, contained in the amniotic sac; the embryo or fetus floats in the amniotic fluid.

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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