pronucleus

pro·nu·cle·us

 (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.

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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.

pronucleus

(ˌprəʊˈnjuːklɪəs)

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

pro•nu•cle•us

(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.

[1875–80]

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

Thesaurus

Noun

1.

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

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