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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.
Origin of unisexual
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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Examples from the Web for unisexual
Historical Examples
  • The leaves are alternate, lanceolate, with a silvery surface; and the flowers are small, green and unisexual.

    The Sea Shore William S. Furneaux
  • Naiadace—Aquatic herbs with inconspicuous, unisexual or bisexual flowers.

    The Sea Shore William S. Furneaux
  • unisexual, with staminate and pistillate flowers on different individuals.

    Michigan Trees Charles Herbert Otis
  • But exactly the same might be said of any other tribe of unisexual animals.

    Parallel Paths Thomas William Rolleston
  • unisexual flowers of Castor-oil plant: s, staminate flower; p, pistillate flower.

  • Polygamous, having some perfect and some unisexual flowers, 85.

  • Many plants produce only unisexual (and therefore imperfect) flowers, which contain either no stamens or no pistil.

    Field and Woodland Plants William S. Furneaux
  • Spikes of unisexual flowers, such as are common among our forest trees, are called catkins.

    Field and Woodland Plants William S. Furneaux
  • The unisexual (male and female) flowers, may be on the same or on different plants.

    On the Origin of Species Charles Darwin
  • The flowers are unisexual; the female flowers are usually borne at the base of the inflorescence, and the male flowers above.

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 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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unisexual 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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