The Collaborative International Dictionary of English v.0.48:

Crow \Crow\, n. [AS. cr[=a]we a crow (in sense 1); akin to D.
   kraai, G. kr[aum]he; cf. Icel. kr[=a]ka crow. So named from
   its cry, from AS. cr[=a]wan to crow. See Crow, v. i. ]
   [1913 Webster]
   1. (Zool.) A bird, usually black, of the genus Corvus,
      having a strong conical beak, with projecting bristles. It
      has a harsh, croaking note. See Caw.
      [1913 Webster]

   Note: The common crow of Europe, or carrion crow, is Corvus
         corone. The common American crow is Corvus
         Americanus. See Carrion crow, and Illustr., under
         Carrion.
         [1913 Webster]

   2. A bar of iron with a beak, crook, or claw; a bar of iron
      used as a lever; a crowbar.
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            Get me an iron crow, and bring it straight
            Unto my cell.                         --Shak.
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   3. The cry of the cock. See Crow, v. i., 1.
      [1913 Webster]

   4. The mesentery of a beast; -- so called by butchers.
      [1913 Webster]

   Carrion crow. See under Carrion.

   Crow blackbird (Zool.), an American bird (Quiscalus
      quiscula); -- called also purple grackle.

   Crow pheasant (Zool.), an Indian cuckoo; the common coucal.
      It is believed by the natives to give omens. See Coucal.


   Crow shrike (Zool.), any bird of the genera Gymnorhina,
      Craticus, or Strepera, mostly from Australia.

   Red-legged crow. See Crough.

   As the crow flies, in a direct line.

   To pick a crow, To pluck a crow, to state and adjust a
      difference or grievance (with any one).
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The Collaborative International Dictionary of English v.0.48:

Carrion \Car"ri*on\, a.
   Of or pertaining to dead and putrefying carcasses; feeding on
   carrion.
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         A prey for carrion kites.                --Shak.
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   Carrion beetle (Zool.), any beetle that feeds habitually on
      dead animals; -- also called sexton beetle and burying
      beetle. There are many kinds, belonging mostly to the
      family Silphid[ae].

   Carrion buzzard (Zool.), a South American bird of several
      species and genera (as Ibycter, Milvago, and
      Polyborus), which act as scavengers. See Caracara.

   Carrion crow, the common European crow (Corvus corone)
      which feeds on carrion, insects, fruits, and seeds.
      [1913 Webster]

WordNet (r) 3.0 (2006):

carrion crow
    n 1: American vulture smaller than the turkey buzzard [syn:
         black vulture, carrion crow, Coragyps atratus]