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 (prō-no͞o′klē-əs, -nyo͞o′-)
n. pl. pro·nu·cle·i (-klē-ī′)
The haploid nucleus of a sperm or egg before fusion of the nuclei in fertilization.

pro·nu′cle·ar adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -clei (-klɪˌaɪ)
(Biology) the nucleus of a mature ovum or spermatozoan before fertilization
pronuclear adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(proʊˈnu kli əs, -ˈnyu-)

n., pl. -cle•i (-kliˌaɪ)
the haploid nucleus of either the sperm or ovum that unites with the opposite-sex nucleus during fertilization.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pronucleus - the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote
cell nucleus, karyon, nucleus - a part of the cell containing DNA and RNA and responsible for growth and reproduction
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The fertilized egg contains haploid female and male pronucleus. The fusion of the pronucleus occurs in ordinary animals (Longo 1997).
The inadequate sperm chromatin decondensation and its transformation into the Male Pronucleus (MPN) together with a failure to activate the oocyte seem to be the major causes behind the poor ICSI efficiency in some species (4,5).
Structures were classified as non-fertilized (absence of sperm and/or male pronucleus); correctly fertilized (presence of two polar bodies and two (male and female) pronuclei); or improperly fertilized (presence of polyspermy, of more than two pronuclei).
Without to ocytes activation, male pronucleus and female pronucleus unable to formed together into zygote.
Male pronucleus formation and early embryonic development after sperm penetration is inhibited if acolytes have no cumulus cells matured.
Of single stranded (S5) and ds DNA breaks, in the sperms the latter have greater mutagenic potential, because of the absence of an error free copy as a template for DNA repair in the G1 phase male pronucleus. The indices of DNA damage increase with decreasing sperm counts (27).