Definitions for: Nucleolus

[n] a small round body of protein in a cell nucleus; nucleoli contain RNA and are involved in protein synthesis

Webster (1913) Definition: Nu*cle"o*lus, n.; pl. Nucleoli. [L., a little nut,
dim. of nucleus.]
1. A little nucleus.

2. (Biol.) A small rounded body contained in the nucleus of a
cell or a protozoan.

Note: It was termed by Agassiz the entoblast. In the
protozoa, where it may be situated on one side of the
nucleus, it is sometimes called the endoplastule, and
is supposed to be concerned in the male part of the
reproductive process. See Nucleus.

Synonyms: nucleole

See Also: cell nucleus, cell organ, karyon, nucleus, organelle

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