Meaning & use
Macronucleus
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The larger of the two types of nuclei found in ciliate protozoans, responsible for controlling everyday cell functions.
See it in a sentence
Under the microscope, the paramecium's macronucleus was clearly visible near its center.
The macronucleus governs routine metabolic activity, while the smaller micronucleus handles genetic exchange during reproduction.
A note on using this word
Found only in ciliates, this dual-nucleus arrangement is a distinctive feature that separates them from most other single-celled organisms.
Words with an opposite meaning
micronucleus
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