[proh-noo-klee-uh s, -nyoo-]See more synonyms for pronucleus on Thesaurus.com
noun, plural pro·nu·cle·i [proh-noo-klee-ahy, -nyoo-] /proʊˈnu kliˌaɪ, -ˈnyu-/. Cell Biology.
- either of the gametic nuclei that unite in fertilization to form the nucleus of the zygote.
Origin of pronucleus
From New Latin,
dating back to 1875–80;
see origin at pro-1
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for pronucleus
noun plural -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
- One of two nuclei undergoing fusion in karyogamy.
- 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.