an animal that feeds on carrion, dead plant material, or refuse

carcasses are usually quickly disposed of by scavengers

foxes are great scavengers

a person who searches for and collects discarded items

a reputation as a scavenger of discarded odds and ends

a person employed to clean the streets

a substance that reacts with and removes particular molecules, groups, etc.

4-aminosalicylic acid is not an effective free radical scavenger