mi·cro·nu·cle·us (mī'krō-nōō'klē-əs, -nyōō'-) n.
pl.mi·cro·nu·cle·i (-klē-ī') or mi·cro·nu·cle·us·es The smaller of two nuclei in ciliate protozoans that contains genetic material and functions in reproduction. mi'cro·nu'cle·ar adj.
Main Entry: mi·cro·nu·cle·us Pronunciation: "mI-krO-'n(y)ü-klE-&s Function: noun : a minute nucleus; specifically: one regarded as primarily concerned with reproductive and genetic functions in most ciliated protozoans —compare MACRONUCLEUS