Definition of pronucleus
:the haploid nucleus of a male or female gamete (such as an egg or sperm) up to the time of fusion with that of another gamete in fertilization
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medical Definition of pronucleus
plural -clei
play
\-klē-ˌī\
also pronucleuses
:the haploid nucleus of a male or female gamete (as an egg or sperm) up to the time of fusion with that of another gamete in fertilization — see female pronucleus, male pronucleus
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Britannica.com: Encyclopedia article about pronucleus
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