Definition of macronucleus
: a relatively large densely staining nucleus of most ciliate protozoans that is derived from micronuclei and controls various nonreproductive functions
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medical Definition of macronucleus
plural macronuclei
play
\-ˌī\
also macronucleuses
: a relatively large densely staining nucleus of most ciliate protozoans that is derived from micronuclei and controls various nonreproductive functions — compare micronucleus
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Britannica.com: Encyclopedia article about macronucleus
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