nucleolus

nu·cle·o·lus

noun \n(y)ü-ˈklē-ə-ləs\

plural nu·cle·o·li \-ˌlī\

Definition of NUCLEOLUS

: a spherical body of the nucleus of most eukaryotes that becomes enlarged during protein synthesis, is associated with a nucleolus organizer, and contains the DNA templates for ribosomal RNA—called also plasmosome

Illustration of NUCLEOLUS