scavenger

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scavenger

1. any animal that feeds on decaying organic matter, esp on refuse
2. a substance added to a chemical reaction or mixture to counteract the effect of impurities

scavenger

[′skav·ən·jər]
(chemistry)
A substance added to a mixture or other system to remove or inactivate impurities. Also known as getter.
(ecology)
An organism that feeds on carrion, refuse, and similar matter.
(metallurgy)
A reactive metal added to a molten metal to combine with and remove dissolved gases.