资料来源 : Webster's Revised Unabridged Dictionary (1913)

   3. A bicycle or a tricycle; a velocipede.

   4. A rolling or revolving body; anything of a circular form;
      a disk; an orb. --Milton.

   5. A turn revolution; rotation; compass.

            According to the common vicissitude and wheel of
            things, the proud and the insolent, after long
            trampling upon others, come at length to be trampled
            upon themselves.                      --South.

            [He] throws his steep flight in many an a["e]ry
            wheel.                                --Milton.

   {A wheel within a wheel}, or {Wheels within wheels}, a
      complication of circumstances, motives, etc.

   {Balance wheel}. See in the Vocab.

   {Bevel wheel}, {Brake wheel}, {Cam wheel}, {Fifth wheel},
   {Overshot wheel}, {Spinning wheel}, etc. See under {Bevel},
      {Brake}, etc.

   {Core wheel}. (Mach.)
      (a) A mortise gear.
      (b) A wheel having a rim perforated to receive wooden
          cogs; the skeleton of a mortise gear.

   {Measuring wheel}, an odometer, or perambulator.

   {Wheel and axle} (Mech.), one of the elementary machines or
      mechanical powers, consisting of a wheel fixed to an axle,
      and used for raising great weights, by applying the power
      to the circumference of the wheel, and attaching the
      weight, by a rope or chain, to that of the axle. Called
      also {axis in peritrochio}, and {perpetual lever}, -- the
      principle of equilibrium involved being the same as in the
      lever, while its action is continuous. See {Mechanical
      powers}, under {Mechanical}.

   {Wheel animal}, or {Wheel animalcule} (Zo["o]l.), any one of
      numerous species of rotifers having a ciliated disk at the
      anterior end.

   {Wheel barometer}. (Physics) See under {Barometer}.

   {Wheel boat}, a boat with wheels, to be used either on water
      or upon inclined planes or railways.

   {Wheel bug} (Zo["o]l.), a large North American hemipterous
      insect ({Prionidus cristatus}) which sucks the blood of
      other insects. So named from the curious shape of the
      prothorax.

   {Wheel carriage}, a carriage moving on wheels.

   {Wheel chains}, or {Wheel ropes} (Naut.), the chains or ropes
      connecting the wheel and rudder.

   {Wheel cutter}, a machine for shaping the cogs of gear
      wheels; a gear cutter.

   {Wheel horse}, one of the horses nearest to the wheels, as
      opposed to a leader, or forward horse; -- called also
      {wheeler}.

   {Wheel lathe}, a lathe for turning railway-car wheels.

   {Wheel lock}.
      (a) A letter lock. See under {Letter}.
      (b) A kind of gunlock in which sparks were struck from a
          flint, or piece of iron pyrites, by a revolving wheel.
      (c) A kind of brake a carriage.

   {Wheel ore} (Min.), a variety of bournonite so named from the
      shape of its twin crystals. See {Bournonite}.

   {Wheel pit} (Steam Engine), a pit in the ground, in which the
      lower part of the fly wheel runs.

   {Wheel plow}, or {Wheel plough}, a plow having one or two
      wheels attached, to render it more steady, and to regulate
      the depth of the furrow.

   {Wheel press}, a press by which railway-car wheels are forced
      on, or off, their axles.

   {Wheel race}, the place in which a water wheel is set.

   {Wheel rope} (Naut.), a tiller rope. See under {Tiller}.

   {Wheel stitch} (Needlework), a stitch resembling a spider's
      web, worked into the material, and not over an open space.
      --Caulfeild & S. (Dict. of Needlework).

   {Wheel tree} (Bot.), a tree ({Aspidosperma excelsum}) of
      Guiana, which has a trunk so curiously fluted that a
      transverse section resembles the hub and spokes of a
      coarsely made wheel. See {Paddlewood}.

   {Wheel urchin} (Zo["o]l.), any sea urchin of the genus
      {Rotula} having a round, flat shell.

   {Wheel window} (Arch.), a circular window having radiating
      mullions arranged like the spokes of a wheel. Cf. {Rose
      window}, under {Rose}.

Overshot \O"ver*shot`\, a.
   From {Overshoot}, v. t.

   {Overshot wheel}, a vertical water wheel, the circumference
      of which is covered with cavities or buckets, and which is
      turned by water which shoots over the top of it, filling
      the buckets on the farther side and acting chiefly by its
      we'ght.