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

1905–10; < Neo-Latin organella, diminutive of Latin organum organ; see -elle Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
organelle (ˌɔːɡəˈnɛl)
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

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')
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
organelles [(awr-guh-nelz)]

Parts of a cell that store food, discharge waste, produce energy, or perform other functions analogous to what organs do in large living things.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Mitochondria are the organelles within the body's cells that generate energy.
Unlike the eukaryotic cells that make up our bodies, bacterial cells don't have
  specialized structures called organelles.
Mitochondria are the organelles in the body's cells that generate energy.
These specialized cells have organelles called nematocysts that contain venom.
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