Nucleolus organizer region
nucleolar organizer
Noun
1. the particular part of a chromosome that is associated with a nucleolus after nuclear division
(synonym) nucleolus organizer, nucleolus organiser, nucleolar organiser
(hypernym) structure, anatomical structure, complex body part, bodily structure, body structure
(part-holonym) chromosome
Nucleolar organizer
A region on a chromosome that is associated with formation of a new nucleolus following cell division. It contains the genes for several species of ribosomal RNA (rRNA), i.e., 18S, 5.8S, 5S and 28S in eukaryotes.