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sexual dimorphism

the condition in which the males and females in a species are morphologically different, as with many birds.
Origin of sexual dimorphism
First recorded in 1885-90
Related forms
sexually dimorphic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for sexual dimorphism

sexual dimorphism

(biology) differences in appearance between the males and females of a species
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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sexual dimorphism in Medicine

sexual dimorphism n.
The physical differences between male and female individuals that arise as a consequence of sexual maturation, including the secondary sex characteristics.

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