macronucleus
noun
the larger of the two types of nuclei occurring in ciliate protozoans, having a multiple set of chromosomes and functioning in cell metabolism and protein synthesis.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“Sequencing the Oxytricha trifallax macronuclear genome: a pilot project.”
From New York Times ● Feb. 10, 2010