noun, plural conceptuses.
the embryo and associated membranes of humans and other highly developed animals.

1935–40; < Neo-Latin; Latin: the action of conceiving, hence, something that is conceived, fetus, embryo, equivalent to concep- (variant stem of concipere to conceive; see concept) + -tus suffix of v. action Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

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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Example sentences
Time of implantation of the conceptus and loss of pregnancy.
The research examines how the maternal system responds to the early developing conceptus.
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