The Collaborative International Dictionary of English v.0.48:

Pheasant \Pheas"ant\ (f[e^]z"ant), n. [OE. fesant, fesaunt, OF.
   faisant, faisan, F. faisan, L. phasianus, Gr. fasiano`s (sc.
   'o`rnis) the Phasian bird, pheasant, fr. Fa`sis a river in
   Colchis or Pontus.]
   1. (Zool.) Any one of numerous species of large gallinaceous
      birds of the genus Phasianus, and many other genera of
      the family Phasianid[ae], found chiefly in Asia.
      [1913 Webster]

   Note: The

   common pheasant, or English pheasant (Phasianus
      Colchicus) is now found over most of temperate Europe,
      but was introduced from Asia. The

   ring-necked pheasant (Phasianus torquatus) and the

   green pheasant (Phasianus versicolor) have been
      introduced into Oregon. The

   golden pheasant (Thaumalea picta) is one of the most
      beautiful species. The

   silver pheasant (Euplocamus nychthemerus) of China, and
      several related species from Southern Asia, are very
      beautiful.
      [1913 Webster]

   2. (Zool.) The ruffed grouse. [Southern U.S.]
      [1913 Webster]

   Note: Various other birds are locally called pheasants, as
         the lyre bird, the leipoa, etc.
         [1913 Webster]

   Fireback pheasant. See Fireback.

   Gold pheasant, or Golden pheasant (Zool.), a Chinese
      pheasant (Thaumalea picta), having rich, varied colors.
      The crest is amber-colored, the rump is golden yellow, and
      the under parts are scarlet.

   Mountain pheasant (Zool.), the ruffed grouse. [Local, U.S.]


   Pheasant coucal (Zool.), a large Australian cuckoo
      (Centropus phasianus). The general color is black, with
      chestnut wings and brown tail. Called also pheasant
      cuckoo. The name is also applied to other allied species.


   Pheasant duck. (Zool.)
      (a) The pintail.
      (b) The hooded merganser.

   Pheasant parrot (Zool.), a large and beautiful Australian
      parrakeet (Platycercus Adelaidensis). The male has the
      back black, the feathers margined with yellowish blue and
      scarlet, the quills deep blue, the wing coverts and cheeks
      light blue, the crown, sides of the neck, breast, and
      middle of the belly scarlet.

   Pheasant's eye. (Bot.)
      (a) A red-flowered herb (Adonis autumnalis) of the
          Crowfoot family; -- called also pheasant's-eye
          Adonis.
      (b) The garden pink (Dianthus plumarius); -- called also
          Pheasant's-eye pink.

   Pheasant shell (Zool.), any marine univalve shell of the
      genus Phasianella, of which numerous species are found
      in tropical seas. The shell is smooth and usually richly
      colored, the colors often forming blotches like those of a
      pheasant.

   Pheasant wood. (Bot.) Same as Partridge wood
      (a), under Partridge.

   Sea pheasant (Zool.), the pintail.

   Water pheasant. (Zool.)
      (a) The sheldrake.
      (b) The hooded merganser.
          [1913 Webster]

WordNet (r) 3.0 (2006):

ring-necked pheasant
    n 1: common pheasant having bright plumage and a white neck ring
         [syn: ring-necked pheasant, Phasianus colchicus]