organelle

[awr-guh-nel, awr-guh-nel]
noun
Cell Biology. a specialized part of a cell having some specific function; a cell organ.

Origin:
1905–10; < Neo-Latin organella, diminutive of Latin organum organ; see -elle

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World English Dictionary
organelle (ˌɔːɡəˈnɛl)
 
n
a structural and functional unit, such as a mitochondrion, in a cell or unicellular organism
 
[C20: from New Latin organella, from Latin organum: see organ]

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Etymonline
Word Origin & History

organelle
1909, from Mod.L. organella, from L. organum instrument, organ (see organ).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

organelle or·gan·elle (ôr'gə-něl')
n.
A differentiated structure within a cell, such as a mitochondrion, vacuole, or microsome, that performs a specific function. Also called organoid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
organelle   (ôr'gə-něl')  Pronunciation Key 
A structure or part that is enclosed within its own membrane inside a cell and has a particular function. Organelles are found only in eukaryotic cells and are absent from the cells of prokaryotes such as bacteria. The nucleus, the mitochondrion, the chloroplast, the Golgi apparatus, the lysosome, and the endoplasmic reticulum are all examples of organelles. Some organelles, such as mitochondria and chloroplasts, have their own genome (genetic material) separate from that found in the nucleus of the cell. Such organelles are thought to have their evolutionary origin in symbiotic bacteria or other organisms that have become a permanent part of the cell.
The American Heritage® Science Dictionary
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Example sentences
Here's a quick key to the image's organelle color coding.
If it falls behind in its protein-folding work, the organelle triggers what researchers have named the unfolded protein response.
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