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nucleolus

[ noo-klee-uh-luhs, nyoo- ]

noun

, Cell Biology.
, plural nu·cle·o·li [noo-, klee, -, uh, -lahy, nyoo-].
  1. a conspicuous, rounded body within the nucleus of a cell.


nucleolus

/ ˌnjuːklɪˈəʊləs /

noun

  1. a small rounded body within a resting nucleus that contains RNA and proteins and is involved in the production of ribosomes Also callednucleole
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


nucleolus

/ no̅o̅-klēə-ləs /

, Plural nucleoli no̅o̅-klēə-lī′

  1. 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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Derived Forms

  • ˌnucleˈolar, adjective
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Word History and Origins

Origin of nucleolus1

1835–45; < Late Latin: small kernel, equivalent to nucle ( us ) kernel ( nucleus ) + -olus -ole 1
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Word History and Origins

Origin of nucleolus1

C19: from Latin, diminutive of nucleus
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Example Sentences

In fact, if they lowered the concentration below a critical threshold, there was no phase separation and no nucleolus.

Their granular nucleus is rounded or oval, and typically contains a single nucleolus.

Each of them has a large nucleus, with a deeply staining small nucleolus, and a very scanty protoplasm.

I have very rarely met with the condition with the single nucleolus described by Schultz in Torpedo.

In anucleate cells there is probably only a single process of layer formation round an infinitely small nucleolus.

And within this nucleus is often to be seen another smaller body, frequently appearing as a mere dot, called the nucleolus.

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nucleolatednucleon