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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.


n, pl -clei (-klɪˌaɪ)
(Biology) the nucleus of a mature ovum or spermatozoan before fertilization
pronuclear adj


(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.
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
References in periodicals archive ?
The female pronucleus also swelled, but the centrosomes associated with the female pronucleus during meiosis disappeared after PB2 formation.
Results: The formation of female pronucleus after ICSI of xenogenic sperm was higher than epididymal and testicular sperm in non-activated oocytes.
Little is known about the formation of the female pronucleus.
A diminutive sperm aster was associated with the sperm nucleus during its decondensation, but no obvious extension toward the female pronucleus was observed.