a person or thing that decomposes.
Ecology. an organism, usually a bacterium or fungus, that breaks down the cells of dead plants and animals into simpler substances.

1815–25; decompose + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decomposer (ˌdiːkəmˈpəʊzə)
ecology consumer See also producer any organism in a community, such as a bacterium or fungus, that breaks down dead tissue enabling the constituents to be recycled to the environment

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1833, "a decomposing agent," agent noun from decompose.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
decomposer   (dē'kəm-pō'zər)  Pronunciation Key 
See detritivore.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Detritivores and decomposers are the final part of food chains.
Be sure to point out the role of decomposers and provide examples.
Remind students that food chains connect organisms through energy transfer among producers, consumers, and decomposers.
Producers are able to utilize the nutrients made by decomposers, so producers
  are dominant over decomposers.
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