资料来源 : pyDict

靶心

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

Bull's-eye \Bull's"-eye`\, n.
   1. (Naut.) A small circular or oval wooden block without
      sheaves, having a groove around it and a hole through it,
      used for connecting rigging.

   2. A small round cloud, with a ruddy center, supposed by
      sailors to portend a storm.

   3. A small thick disk of glass inserted in a deck, roof,
      floor, ship's side, etc., to let in light.

   4. A circular or oval opening for air or light.

   5. A lantern, with a thick glass lens on one side for
      concentrating the light on any object; also, the lens
      itself. --Dickens.

   6. (Astron.) Aldebaran, a bright star in the eye of Taurus or
      the Bull.

   7. (Archery & Gun.) The center of a target.

   8. A thick knob or protuberance left on glass by the end of
      the pipe through which it was blown.

   9. A small and thick old-fashioned watch. [Colloq.]



   3. (Chem.) An apparatus for receiving and condensing the
      volatile products of distillation to a liquid or solid
      form, by cooling.

   4. (Steam Engine) An apparatus, separate from the cylinder,
      in which the exhaust steam is condensed by the action of
      cold water or air. See Illust. of {Steam engine}.

   {Achromatic condenser} (Optics), an achromatic lens used as a
      condenser.

   {Bull's-eye condenser}, or {Bull's-eye} (Optics), a lens of
      short focal distance used for concentrating rays of light.
      

   {Injection condenser}, a vessel in which steam is condensed
      by the direct contact of water.

   {Surface condenser}, an apparatus for condensing steam,
      especially the exhaust of a steam engine, by bringing it
      into contact with metallic surface cooled by water or air.