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.
      [1913 Webster]

            Get me an iron crow, and bring it straight
            Unto my cell.                         --Shak.
      [1913 Webster]

   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).
      [1913 Webster]

WordNet (r) 3.0 (2006):

as the crow flies
    adv 1: by the shortest and most direct route; "it's 10 miles as
           the crow flies"

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "as the crow flies":
   dead, dead ahead, direct, directly, due, due north, forthright,
   in a beeline, in line with, right, straight, straight across,
   straight ahead, straightforward, straightforwards, straightly,
   undeviatingly, unswervingly, unveeringly