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