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conceptus

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con·cep·tus

[kuhn-sep-tuhs]
–noun,plural-tus·es.
the embryo and associated membranes of humans and other highly developed animals.

Origin:
1935–40; < NL; L: the action of conceiving, hence, something that is conceived, fetus, embryo, equiv. to concep- (var. s. of concipere to conceive; see concept) + -tus suffix of v. action
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Based on the Random House Dictionary, © Random House, Inc. 2010.
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con·cep·tus   (kən-sěp'təs)   
n.  The product of conception at any point between fertilization and birth. It includes the embryo or the fetus as well as the extraembryonic membranes.

[Latin, something conceived; see concept.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: con·cep·tus
Pronunciation: k&n-'sep-t&s
Function: noun
: a fertilized egg, embryo, or fetus
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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conceptus con·cep·tus (kən-sěp'təs)
n. pl. con·cep·tus·es
The products of conception; that is, the embryo, chorionic sac, placenta, and fetal membranes.

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