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[par-thuh-noh-jen-uh-sis] /ˌpær θə noʊˈdʒɛn ə sɪs/
noun, Biology
development of an egg without fertilization.
1840-50; partheno- + genesis
Related forms
[pahr-thuh-noh-juh-net-ik] /ˌpɑr θə noʊ dʒəˈnɛt ɪk/ (Show IPA),
parthenogenetically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for parthenogenesis
  • Polyploid animals are often sterile, so they often reproduce by parthenogenesis.
British Dictionary definitions for parthenogenesis


a type of reproduction, occurring in some insects and flowers, in which the unfertilized ovum develops directly into a new individual
human conception without fertilization by a male; virgin birth
Derived Forms
parthenogenetic (ˌpɑːθɪˌnəʊdʒɪˈnɛtɪk) adjective
parthenogenetically, adverb
Word Origin
C19: from Greek parthenos virgin + genesis birth
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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Word Origin and History for parthenogenesis

"reproduction without fertilization," 1849, from Greek parthenos "virgin," of unknown origin, + genesis (see genesis). Related: Parthenogenetic.

Online Etymology Dictionary, © 2010 Douglas Harper
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parthenogenesis in Medicine

parthenogenesis par·the·no·gen·e·sis (pär'thə-nō-jěn'ĭ-sĭs)
A form of reproduction in which an unfertilized egg develops into a new individual, occurring commonly among insects and certain other arthropods.

par'the·no·ge·net'ic (-jə-nět'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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parthenogenesis in Science
Reproduction in which an egg develops into a new individual without being fertilized. Aphids and certain other insects can reproduce by parthenogenesis. Parthenogenesis does not necessarily produce clones of the parent. Among hymenopterans such as honeybees and ants, the haploid males develop from unfertilized eggs laid by the queen, who is diploid. Parthenogenesis is a form of apomixis.

parthenogenetic adjective (pär'thə-nō-jə-nět'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for parthenogenesis

biological reproduction that involves development of a female (rarely a male) gamete (sex cell) without fertilization. It occurs commonly among lower plants and invertebrate animals, particularly rotifers, aphids, ants, wasps, and bees. An egg produced parthenogenetically may be either haploid (i.e., with one set of dissimilar chromosomes) or diploid (i.e., with a paired set of chromosomes).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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