nucleolus

nucleolus /nu·cle·o·lus/ (noo-kle´o-lus) pl. nucle´oli   [L.] a rounded refractile body in the nucleus of most cells, which is the site of synthesis of ribosomal RNA.

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nu·cle·o·lus (n-kl-ls)

n. pl. nu·cle·o·li (-l)

A small, typically round granular body composed of protein and RNA in the nucleus of a cell, usually associated with a specific chromosomal site and involved in ribosomal RNA synthesis and the formation of ribosomes.

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nu·cleo·lar (-lr) adj.

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nucleolus

pl. nucleoli [L.] a rounded refractile body in the nucleus of most cells, which is the site of synthesis of ribosomal RNA, becoming enlarged during periods of synthesis and smaller during quiescent periods; multiple nucleoli occur in some cells.

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nucleolus organizer site

chromosomal sites for attachment of nucleoli.