nucleolus

[noo-klee-uh-luhs, nyoo-]
noun, plural nucleoli [noo-klee-uh-lahy, nyoo-] . Cell Biology.
a conspicuous, rounded body within the nucleus of a cell.

Origin:
1835–45; < Late Latin: small kernel, equivalent to nucle(us) kernel (see nucleus) + -olus -ole1

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World English Dictionary
nucleolus (ˌnjuːklɪˈəʊləs)
 
n , pl -li
Also called: nucleole a small rounded body within a resting nucleus that contains RNA and proteins and is involved in the production of ribosomes
 
[C19: from Latin, diminutive of nucleus]
 
nucle'olar
 
adj
 
'nucleolate
 
adj
 
'nucleolated
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

nucleolus nu·cle·o·lus (nōō-klē'ə-ləs, nyōō-)
n. pl. nu·cle·o·li (-lī')
A small, typically round granular body composed of protein and RNA in the nucleus of a cell, usually associated with a specific chromosomal site and involved in ribosomal RNA synthesis and the formation of ribosomes.


nu·cle'o·lar (-lər) adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
nucleolus   (n-klē'ə-ləs)  Pronunciation Key 
Plural nucleoli (n-klē'ə-lī')
A small, typically spherical granular body located in the nucleus of a eukaryotic cell, composed largely of protein and RNA. When the cell is not undergoing division, loops of DNA from one or more chromosomes extend into the nucleolus and direct the synthesis of ribosomal RNA and the formation of ribosomes. The ribosomes are eventually transferred out of the nucleus via pores in the nuclear envelope into the cytoplasm.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The nucleus exhibits an intranuclear network and one or two refractile nucleoli.
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