[yoo-nuh-sek-shoo-uh l]


of or relating to one sex only.
having only male or female organs in one individual, as an animal or a flower.

Origin of unisexual

First recorded in 1795–1805; uni- + sexual
Related formsu·ni·sex·u·al·i·ty, nounu·ni·sex·u·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for unisexual

bisexual, epicene, hermaphrodite, trans-sexual, unisexual

Examples from the Web for unisexual

Historical Examples of unisexual

  • The unisexual (male and female) flowers, may be on the same or on different plants.

  • Naiadace—Aquatic herbs with inconspicuous, unisexual or bisexual flowers.

    The Sea Shore

    William S. Furneaux

  • But exactly the same might be said of any other tribe of unisexual animals.

    Parallel Paths

    Thomas William Rolleston

  • Unisexual, with staminate and pistillate flowers on different individuals.

    Michigan Trees

    Charles Herbert Otis

  • Unisexual, with staminate and pistillate flowers on the same individual.

    Michigan Trees

    Charles Herbert Otis

British Dictionary definitions for unisexual



of or relating to one sex only
(of some organisms) having either male or female reproductive organs but not both
Derived Formsunisexuality, noununisexually, 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

unisexual in Science



Having the sex organs of only one sex; not hermaphroditic. Used of organisms.
Having stamens and pistils in separate flowers borne on the same plant; diclinous. Used of flowers.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.