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Definition of Macronucleus
1. Noun. (biology) The larger the two nuclei present in ciliate protozoans; it controls the nonreproductive functions of the cell. ¹
¹ Source: wiktionary.com
Definition of Macronucleus
1. [n -NUCLEI]
Medical Definition of Macronucleus
1. The larger nucleus (or sometimes nuclei) in ciliate protozoans. Derived from the micronucleus by a process of DNA polytenisation. The DNA in the macronucleus is actively transcribed. The macronucleus degenerates before conjugation. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)