\Bel"lows\, n. sing. & pl. [OE. bely, below, belly,
bellows, AS. b[ae]lg, b[ae]lig, bag, bellows, belly. Bellows
is prop. a pl. and the orig. sense is bag. See {Belly}.]
An instrument, utensil, or machine, which, by alternate
expansion and contraction, or by rise and fall of the top,
draws in air through a valve and expels it through a tube for
various purposes, as blowing fires, ventilating mines, or
filling the pipes of an organ with wind.
{Bellows camera}, in photography, a form of camera, which can
   be drawn out like an accordion or bellows.
{Hydrostatic bellows}. See {Hydrostatic}.
{A pair of bellows}, the ordinary household instrument for
   blowing fires, consisting of two nearly heart-shaped
   boards with handles, connected by leather, and having a
   valve and tube.