micronucleus[mī′krō no̵̅o̅′klē əs, -nyo̵̅o̅′-]
the smaller of two types of nuclei present in the cells of ciliated protozoans, associated primarily with reproduction and genetics
nounpl. mi·cro·nu·cle·i or mi·cro·nu·cle·us·es
The smaller of two nuclei in ciliate protozoans that contains genetic material and functions in reproduction.