The Collaborative International Dictionary of English v.0.48:

Turkey \Tur"key\ (t[^u]r"k[=e]), n.; pl. Turkeys. [So called
   because it was formerly erroneously believed that it came
   originally from Turkey: cf. F. Turquie Turkey. See Turk.]
   (Zool.)
   Any large American gallinaceous bird belonging to the genus
   Meleagris, especially the North American wild turkey
   (Meleagris gallopavo), and the domestic turkey, which was
   probably derived from the Mexican wild turkey, but had been
   domesticated by the Indians long before the discovery of
   America.
   [1913 Webster]

   Note: The Mexican wild turkey is now considered a variety of
         the northern species (var. Mexicana). Its tail feathers
         and coverts are tipped with white instead of brownish
         chestnut, and its flesh is white. The Central American,
         or ocellated, turkey (Meleagris ocellata) is more
         elegantly colored than the common species. See under
         Ocellated. The Australian, or native, turkey is a
         bustard (Choriotis australis). See under Native.
         [1913 Webster]

   Turkey beard (Bot.), a name of certain American perennial
      liliaceous herbs of the genus Xerophyllum. They have a
      dense tuft of hard, narrowly linear radical leaves, and a
      long raceme of small whitish flowers. Also called
      turkey's beard.

   Turkey berry (Bot.), a West Indian name for the fruit of
      certain kinds of nightshade (Solanum mammosum, and
      Solanum torvum).

   Turkey bird (Zool.), the wryneck. So called because it
      erects and ruffles the feathers of its neck when
      disturbed. [Prov. Eng.]

   Turkey buzzard (Zool.), a black or nearly black buzzard
      (Cathartes aura), abundant in the Southern United
      States. It is so called because its naked and warty head
      and neck resemble those of a turkey. It is noted for its
      high and graceful flight. Called also turkey vulture.

   Turkey cock (Zool.), a male turkey.

   Turkey hen (Zool.), a female turkey.

   Turkey pout (Zool.), a young turkey. [R.]

   Turkey vulture (Zool.), the turkey buzzard.
      [1913 Webster]