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[proh-noo-klee-uh s, -nyoo-] /proʊˈnu kli əs, -ˈnyu-/
noun, plural pronuclei
[proh-noo-klee-ahy, -nyoo-] /proʊˈnu kliˌaɪ, -ˈnyu-/ (Show IPA).
Cell Biology
either of the gametic nuclei that unite in fertilization to form the nucleus of the zygote.
Origin of pronucleus
1875-80; < New Latin; see pro-1, nucleus Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for pronucleus


noun (pl) -clei (-klɪˌaɪ)
the nucleus of a mature ovum or spermatozoan before fertilization
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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pronucleus in Medicine

pronucleus pro·nu·cle·us (prō-nōō'klē-əs, -nyōō'-)

  1. One of two nuclei undergoing fusion in karyogamy.

  2. The haploid nucleus of a sperm or egg before fusion of the nuclei in fertilization.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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