pro nuclei

pronucleus

[proh-noo-klee-uhs, -nyoo-]
noun, plural pronuclei [proh-noo-klee-ahy, -nyoo-] . Cell Biology.
either of the gametic nuclei that unite in fertilization to form the nucleus of the zygote.

Origin:
1875–80; < Neo-Latin; see pro-1, nucleus

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World English Dictionary
pronucleus (ˌprəʊˈnjuːklɪəs)
 
n , pl -clei
the nucleus of a mature ovum or spermatozoan before fertilization

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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

  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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