The Collaborative International Dictionary of English v.0.48:

Hopper \Hop"per\, n. [See 1st Hop.]
   1. One who, or that which, hops.
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   2. A chute, box, or receptacle, usually funnel-shaped with an
      opening at the lower part, for delivering or feeding any
      material, as to a machine; as, the wooden box with its
      trough through which grain passes into a mill by joining
      or shaking, or a funnel through which fuel passes into a
      furnace, or coal, etc., into a car.
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   3. (Mus.) See Grasshopper, 2.
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   4. pl. A game. See Hopscotch. --Johnson.
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   5. (Zool.)
      (a) See Grasshopper, and Frog hopper, Grape hopper,
          Leaf hopper, Tree hopper, under Frog, Grape,
          Leaf, and Tree.
      (b) The larva of a cheese fly.
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   6. (Naut.) A vessel for carrying waste, garbage, etc., out to
      sea, so constructed as to discharge its load by a
      mechanical contrivance; -- called also dumping scow.
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   Bell and hopper (Metal.), the apparatus at the top of a
      blast furnace, through which the charge is introduced,
      while the gases are retained.

   Hopper boy, a rake in a mill, moving in a circle to spread
      meal for drying, and to draw it over an opening in the
      floor, through which it falls.

   Hopper closet, a water-closet, without a movable pan, in
      which the receptacle is a funnel standing on a draintrap.


   Hopper cock, a faucet or valve for flushing the hopper of a
      water-closet.
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