Definition of Nucleolus

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

Exact synonyms: Nucleole
Group relationships: Cell Nucleus, Karyon, Nucleus
Generic synonyms: Cell Organ, Cell Organelle, Organelle

Definition of Nucleolus

1. n. A little nucleus.

Definition of Nucleolus

1. Noun. (cytology) A conspicuous, rounded body within the nucleus of a cell. ¹

¹ Source:

Definition of Nucleolus

1. a nucleole [n -LI] - See also: nucleole

Medical Definition of Nucleolus

1. A small dense body (sub organelle) within the nucleus of eukaryotic cells, visible by phase contrast and interference microscopy in live cells throughout interphase. Contains RNA and protein and is the site of synthesis of ribosomal RNA. The nucleolus surrounds a region of one or more chromosomes (the nucleolar organiser) in which are repeated copies of the DNA coding for ribosomal RNA. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Nucleolus Pictures

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Lexicographical Neighbors of Nucleolus

nucleolar-nuclear ratio
nucleolar chromosome
nucleolar organiser
nucleolar organizer
nucleolar zone
nucleolus (current term)
nucleolus organiser
nucleolus organiser region
nucleolus organizer
nucleon number

Literary usage of Nucleolus

Below you will find example usage of this term as found in modern and/or classical literature:

1. Biological Bulletin by Marine Biological Laboratory (Woods Hole, Mass.) (1916)
"The work on the true nucleolus has been greatly retarded by the ... To prevent further confusion, I shall use the older and more familiar term, "nucleolus. ..."

2. Fecundation in Plants by David Myers Mottier (1904)
"THE nucleolus. In the resting nucleus and during the prophase, ... As has been mentioned in a preceding paragraph, the nucleolus very frequently lies within ..."

3. Manual of Human and Comparative Histology by Salomon Stricker (1872)
"The nucleolus is a structure that nerve cells usually exhibit with extraordinary sharpness of outline. It is, however, peculiarly distinct in the strongly ..."

4. The American Naturalist by American Society of Naturalists, Essex Institute (1905)
"The term plastin has been applied to such substance in the nucleolus and also in ... A nucleolus may consist of plastin alone, or have with this substance ..."

5. Normal Histology: With Special Reference to the Structure of the Human Body by George Arthur Piersol (1916)
"Concerning the nature, purpose and function of the nucleolus much uncertainty exists. According to some authorities these bodies are to be regarded Ar~r~\ ..."

6. Text-book of normal histology: including an account of the development of by George Arthur Piersol (1904)
"The nucleolus lies closely approximated to, but separated from, the nuclear fibrils, being especially evident in such elements as ganglionic nerve-cells, ..."

7. Elementary Text-book of Zoology by K[arl] Claus, F. G. Heathcote, Carl F. Claus (1884)
"... and may contain one or more solid bodies (nucleolus). Different its are the forms which the nucleus may take, it always contains a fluid substance, ..."

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