scavenger

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scavenger

(skăv′ən-jər)
n.
1. An animal, such as a vulture or housefly, that feeds on dead or decaying matter.
2. Chemistry A substance added to a mixture to remove or inactivate impurities.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

scavenger

any organism that feeds on carrion, refuse or material left unconsumed by other organisms. See also SAPROBIONT.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005