Webster's English Dictionary

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bellows

bel.lows \'bel-(.)o-z, -*z\ n [ME bely, below, belwes - more at BELLY] pl 
   but sing or pl in constr  1: an instrument or machine that by expansion and 
   contraction draws in air  through a valve or orifice and expels it through 
   a tube; also : any of various other blowers 2: LUNGS  3: the expansible 
   part in a camera