資料來源 : Webster's Revised Unabridged Dictionary (1913)

Water wheel \Wa"ter wheel`\
   1. Any wheel for propelling machinery or for other purposes,
      that is made to rotate by the direct action of water; --
      called an {overshot wheel} when the water is applied at
      the top, an {undershot wheel} when at the bottom, a
      {breast wheel} when at an intermediate point; other forms
      are called {reaction wheel}, {vortex wheel}, {turbine
      wheel}, etc.

   2. The paddle wheel of a steam vessel.

   3. A wheel for raising water; a noria, or the like.

Turbine \Tur"bine\, n. [L. turbo, -inis, that which spins or
   whirls round, whirl.]
   A water wheel, commonly horizontal, variously constructed,
   but usually having a series of curved floats or buckets,
   against which the water acts by its impulse or reaction in
   flowing either outward from a central chamber, inward from an
   external casing, or from above downward, etc.; -- also called
   {turbine wheel}.

   Note: In some turbines, the water is supplied to the wheel
         from below, instead of above. Turbines in which the
         water flows in a direction parallel to the axis are
         called parallel-flow turbines.