Macronucleus
Noun
macronucleus
(plural macronuclei)- (biology) The larger of the two nuclei present in ciliate protozoans; it controls the nonreproductive functions of the cell.
- 1890 Proceedings, American Philosophical SocietyThese binucleated forms have one macronucleus functional and another sexual micronucleus which is not functional in the ordinary life processes of the species.