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Meaning of micronucleus

mi•cro•nu•cle•us

Pronunciation: (mī"krō-n'klē-us, -ny'-), [key]
— pl. -cle•i
  1. the smaller of the two types of nuclei occurring in ciliate protozoans. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.