The Collaborative International Dictionary of English v.0.48:

Fowl \Fowl\ (foul), n.

   Note: Instead of the pl. Fowls the singular is often used
         collectively. [OE. foul, fowel, foghel, fuhel, fugel,
         AS. fugol; akin to OS. fugal D. & G. vogel, OHG. fogal,
         Icel. & Dan. fugl, Sw. fogel, f[*a]gel, Goth. fugls; of
         unknown origin, possibly by loss of l, from the root of
         E. fly, or akin to E. fox, as being a tailed animal.]
   1. Any bird; esp., any large edible bird.
      [1913 Webster]

            Let them have dominion over the fish of the sea, and
            over the fowl of the air.             --Gen. i. 26.
      [1913 Webster]

            Behold the fowls of the air; for they sow not.
                                                  --Matt. vi.
                                                  26.
      [1913 Webster]

            Like a flight of fowl
            Scattered by winds and high tempestuous gusts.
                                                  --Shak.
      [1913 Webster]

   2. Any domesticated bird used as food, as a hen, turkey,
      duck; in a more restricted sense, the common domestic cock
      or hen (Gallus domesticus).
      [1913 Webster]

   Barndoor fowl, or Barnyard fowl, a fowl that frequents
      the barnyard; the common domestic cock or hen.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fowl \Fowl\, v. i. [imp. & p. p. Fowled; p. pr. & vb. n.
   Fowling.]
   To catch or kill wild fowl, for game or food, as by shooting,
   or by decoys, nets, etc.
   [1913 Webster]

         Such persons as may lawfully hunt, fish, or fowl.
                                                  --Blackstone.
   [1913 Webster]

   Fowling piece, a light gun with smooth bore, adapted for
      the use of small shot in killing birds or small
      quadrupeds.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fowl
    n 1: a domesticated gallinaceous bird thought to be descended
         from the red jungle fowl [syn: domestic fowl, fowl,
         poultry]
    2: the flesh of a bird or fowl (wild or domestic) used as food
       [syn: bird, fowl]
    v 1: hunt fowl
    2: hunt fowl in the forest

Moby Thesaurus II by Grady Ward, 1.0:

153 Moby Thesaurus words for "fowl":
   Bantam, Cornish hen, avifauna, baby bird, banty, barn-door fowl,
   barnyard fowl, beat, biddy, bird, bird of Jove, bird of Juno,
   bird of Minerva, bird of night, bird of passage, bird of prey,
   birdie, birdlife, birdy, breast, broiler, brooder, broody hen,
   cage bird, caille, canard, caneton, capon, chanticleer, chapon,
   chase, chick, chickabiddy, chicken, chicken foot, chicky, cock,
   cockerel, course, cygnet, dark meat, dindon, diving bird, dog,
   domestic fowl, dove, drake, drive, drumstick, duck, duckling,
   dunghill fowl, eagle, eaglet, faisan, falcon, fish-eating bird,
   fledgling, flightless bird, flush, follow the hounds,
   fruit-eating bird, fryer, fulmar, game bird, game fowl, gander,
   giblets, go hunting, gobbler, goose, gosling, grouse, guinea cock,
   guinea fowl, guinea hen, gun, hawk, hen, hen turkey, hound, hunt,
   hunt down, insect-eating bird, jack, jacklight, leg, migrant,
   migratory bird, neck, nestling, oie, oscine bird, owl, oyster,
   partlet, partridge, passerine bird, peacock, peafowl, peahen,
   perching bird, pheasant, pigeon, pigeonneau, poulard, poulet,
   poult, poultry, prowl after, pullet, quail, ratite, ride to hounds,
   roaster, rooster, run, sea bird, seed-eating bird, setting hen,
   shikar, shoot, shore bird, songbird, sport, spring chicken, squab,
   stalk, start, stewing chicken, still-hunt, storm petrel,
   stormy petrel, swan, thigh, tom, tom turkey, track, trail, turkey,
   turkey foot, turkey gobbler, turkey-cock, volaille, wading bird,
   warbler, water bird, waterfowl, white meat, wild duck, wildfowl,
   wing, wishbone