Reference > The New Dictionary of Cultural Literacy > 21. Life Sciences
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  The New Dictionary of Cultural Literacy, Third Edition.  2002.
 
fetus
 
 
The embryo of an animal that bears its young alive (rather than laying eggs). In humans, the embryo is called a fetus after all major body structures have formed; this stage is reached about sixty days after fertilization.  1
 
 
The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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