nucleolus

A small body in the nucleus of a cell that contains protein and RNA and is the site for the synthesis of ribosomal RNA and for the formation of ribosomal subunits.

In zoology, the nucleus of a nucleus; one of the rounded deeply staining structures found in the nucleus of a cell.

Specifically, in Infusoria, a minute particle attached to the exterior of the nucleus (or “ovary”), supposed to function as a testicle.

In botany, a small solid rounded granule or particle in the interior of the nucleus. There may be several nucleoli in each nucleus.

A little nucleus.

A small rounded body contained in the nucleus of a cell or a protozoan.

A conspicuous, rounded body within the nucleus of a cell.

a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis