Source : Webster's Revised Unabridged Dictionary (1913)

Extinguisher \Ex*tin"guish*er\, n.
   One who, or that which, extinguishes; esp., a hollow cone or
   other device for extinguishing a flame, as of a torch or
   candle.

Source : WordNet®

extinguisher
     n : a manually operated device for extinguishing small fires
         [syn: {fire extinguisher}, {asphyxiator}]