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.

scavenger

any organism that feeds on carrion, refuse or material left unconsumed by other organisms. See also SAPROBIONT.