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[yoo-nuh-sek-shoo-uh l] /ˌyu nəˈsɛk ʃu əl/
of or relating to one sex only.
having only male or female organs in one individual, as an animal or a flower.
1795-1805; uni- + sexual
Related forms
unisexuality, noun
unisexually, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for unisexuality


of or relating to one sex only
(of some organisms) having either male or female reproductive organs but not both
Derived Forms
unisexuality, noun
unisexually, adverb
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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unisexuality in Science
  1. Having the sex organs of only one sex; not hermaphroditic. Used of organisms.

  2. Having stamens and pistils in separate flowers borne on the same plant; diclinous. Used of flowers.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for unisexuality

in biology, the condition of an organism or species capable of producing only male or female gametes (sex cells) but never both. A unisexual organism of a bisexual species is one in which the male and female gonads are found in separate individuals. In plants this condition is often called dioecism. A unisexual species is one in which all individuals are of the same sex. Some species of whiptail lizards, for example, are only female. New individuals grow from eggs that develop without fertilization (parthenogenesis).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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