noun, plural mi·cro·nu·cle·i [mahy-kroh-noo-klee-ahy, –nyoo-] /ˌmaɪ kroʊˈnu kliˌaɪ, -ˈnyu-/. Biology.
- the smaller of the two types of nuclei occurring in ciliate protozoans.
noun plural -clei (-klɪˌaɪ) or -cleuses
- the smaller of two nuclei in ciliated protozoans, involved in reproductionCompare macronucleus
- A minute nucleus.
- The smaller of two nuclei in ciliate protozoans that contains genetic material and functions in reproduction.