Source : Webster's Revised Unabridged Dictionary (1913)

Scrubber \Scrub"ber\, n.
   1. One who, or that which, scrubs; esp., a brush used in
      scrubbing.

   2. (Gas Manuf.) A gas washer. See under {Gas}.

Source : WordNet®

scrubber
     n 1: a worker who uses a scrub brush to clean a surface (usually
          a floor or deck)
     2: a brush with short stiff bristles for heavy cleaning [syn: {scrub
        brush}, {scrubbing brush}]
     3: a purifier that removes impurities from a gas