air hammer

from WordNet (r) 3.0 (2006)
air hammer
    n 1: a hammer driven by compressed air [syn: {air hammer},
         {jackhammer}, {pneumatic hammer}]
    
from The Collaborative International Dictionary of English v.0.48
Air hammer \Air hammer\
   a hammer powered by compressed air so as to be able to
   provide powerful repeated strokes; a pneumatic hammer.
   [PJC]
    

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