Source : Webster's Revised Unabridged Dictionary (1913)

Hopper \Hop"per\, n. [See 1st {Hop}.]
   1. One who, or that which, hops.

   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.

   3. (Mus.) See {Grasshopper}, 2.

   4. pl. A game. See {Hopscotch}. --Johnson.

   5. (Zo["o]l.)
      (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.

   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}.

   {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.

Source : WordNet®

hopper
     n 1: funnel-shaped receptacle; contents pass by gravity into a
          receptacle below
     2: someone who hops; "at hopscotch, the best hoppers are the
        children"
     3: a machine used for picking hops [syn: {hop-picker}]
     4: terrestrial plant-eating insect with hind legs adapted for
        leaping [syn: {grasshopper}]
     5: (baseball) a hit that travels along the ground [syn: {grounder},
         {ground ball}, {groundball}]