adjective Embryology.
of, pertaining to, or having the character of a fetus.
Also, foetal.

1805–15; fet(us) + -al1

postfetal, adjective
postfoetal, adjective

fatal, fateful, fetal (see synonym study at fatal).
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World English Dictionary
fetal or foetal (ˈfiːtəl)
of, relating to, or resembling a fetus
foetal or foetal

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

formed in English 1811, from fetus + -al (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fetal fe·tal (fēt'l)
Of, relating to, or being a fetus.

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
fetus   (fē'təs)  Pronunciation Key 
The unborn offspring of a mammal at the later stages of its development, especially a human from eight weeks after fertilization to its birth. In a fetus, all major body organs are present.

fetal adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Brains are expensive-it takes a lot of energy to build brains during fetal and
  childhood development and maintain them in adults.
There is also a fetal skull with a flexible gooseneck wire.
Intervening in fetal nutrition is not a simple matter, of course.
The company's cells are isolated from human fetal tissue and then grown in
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