micronucleus

[ mahy-kroh-noo-klee-uhs, -nyoo- ]

noun

, Biology.

, plural mi·cro·nu·cle·i [mahy-kroh-, noo, -klee-ahy, -, nyoo, -].

1. the smaller of the two types of nuclei occurring in ciliate protozoans.

micronucleus

/ ˌmaɪkrəʊˈnjuːklɪəs /

noun

1. See macronucleus
   the smaller of two nuclei in ciliated protozoans, involved in reproduction Compare macronucleus

Other Words From

• micro·nucle·ar adjective

Word History and Origins

Origin of micronucleus¹

First recorded in 1890–95; micro- + nucleus

Example Sentences

As noted, in fission the meganucleus divides by direct constriction; each micronucleus by a mode of mitosis.

From Project Gutenberg

The macronucleus is usually dorsal, elliptical, and cleft, with one micronucleus attached.

From Project Gutenberg

The macronucleus is spheroidal and placed near the center of the body; a conspicuous micronucleus lies near it.

From Project Gutenberg

The macronucleus is central, spherical in form, and bears a single minute micronucleus.

From Project Gutenberg

The macronucleus is spherical, centrally placed, and with one micronucleus closely applied.

From Project Gutenberg