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nucleolus (n.)

"a small nucleus; the nucleus of a nucleus," 1839, from Latin nucleolus, literally "a little nut," diminutive of nucleus (see nucleus). Related: Nucleolar.

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Definitions of nucleolus from WordNet

nucleolus (n.)
a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis;
Synonyms: nucleole
From wordnet.princeton.edu