A worker who removes refuse.
An algorithm, procedure or thread dedicated to garbage collection: reclaiming resources which are no longer in use.
Someone who scavenges, especially one who searches through rubbish for food or useful things.
A child employed to pick up loose cotton from the floor in a cotton mill.
An animal that feeds on decaying matter such as carrion.
A substance used to remove impurities from the air or from a solution.