Scrubber /(skrŭb"bẽr)/

Scrub·ber

Scrubber

n.
  1. One who, or that which, scrubs; esp., a brush or machine used in scrubbing.
  2. A gas washer. See under Gas. (Gas Manuf.)
  3. a device for removing pollutants from a gas stream, especially for removing sulfur oxides from processes burning coal or oil. (Manufacturing)

Scrubber

n.
  1. a stunted or emaciated steer.
  2. A person who lives in the bush. [Australian]
  3. A domesticated animal which has escaped and lives wild in the bush. [Australian]