The Collaborative International Dictionary of English v.0.48:

Bird \Bird\ (b[~e]rd), v. i.
   1. To catch or shoot birds.
      [1913 Webster]

   2. Hence: To seek for game or plunder; to thieve. [R.] --B.
      Jonson.
      [1913 Webster]

   3. to watch birds, especially in their natural habitats, for
      enjoyment; to birdwatch.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Bird \Bird\ (b[~e]rd), n. [OE. brid, bred, bird, young bird,
   bird, AS. bridd young bird. [root]92.]
   1. Orig., a chicken; the young of a fowl; a young eaglet; a
      nestling; and hence, a feathered flying animal (see 2).
      [1913 Webster]

            That ungentle gull, the cuckoo's bird. --Shak.
      [1913 Webster]

            The brydds [birds] of the aier have nestes.
                                                  --Tyndale
                                                  (Matt. viii.
                                                  20).
      [1913 Webster]

   2. (Zool.) A warm-blooded, feathered vertebrate provided with
      wings. See Aves.
      [1913 Webster]

   3. Specifically, among sportsmen, a game bird.
      [1913 Webster]

   4. Fig.: A girl; a maiden.
      [1913 Webster]

            And by my word! the bonny bird
            In danger shall not tarry.            --Campbell.
      [1913 Webster]

   Arabian bird, the phenix.

   Bird of Jove, the eagle.

   Bird of Juno, the peacock.

   Bird louse (Zool.), a wingless insect of the group
      Mallophaga, of which the genera and species are very
      numerous and mostly parasitic upon birds. -- Bird mite
      (Zool.), a small mite (genera Dermanyssus,
      Dermaleichus and allies) parasitic upon birds. The
      species are numerous.

   Bird of passage, a migratory bird.

   Bird spider (Zool.), a very large South American spider
      (Mygale avicularia). It is said sometimes to capture and
      kill small birds.

   Bird tick (Zool.), a dipterous insect parasitic upon birds
      (genus Ornithomyia, and allies), usually winged.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bird
    n 1: warm-blooded egg-laying vertebrates characterized by
         feathers and forelimbs modified as wings
    2: the flesh of a bird or fowl (wild or domestic) used as food
       [syn: bird, fowl]
    3: informal terms for a (young) woman [syn: dame, doll,
       wench, skirt, chick, bird]
    4: a cry or noise made to express displeasure or contempt [syn:
       boo, hoot, Bronx cheer, hiss, raspberry, razzing,
       razz, snort, bird]
    5: badminton equipment consisting of a ball of cork or rubber
       with a crown of feathers [syn: shuttlecock, bird,
       birdie, shuttle]
    v 1: watch and study birds in their natural habitat [syn:
         bird, birdwatch]

Moby Thesaurus II by Grady Ward, 1.0:

93 Moby Thesaurus words for "bird":
   Bronx cheer, Jane, atomic warhead, avifauna, baby bird, bastard,
   biddy, bird of Jove, bird of Juno, bird of Minerva, bird of night,
   bird of passage, bird of prey, birdie, birdlife, birdy, bitch, boo,
   broad, bugger, cage bird, cat, catcall, chap, character, chick,
   cygnet, dame, diving bird, doll, dove, duck, eagle, eaglet, feller,
   fellow, fish-eating bird, fledgling, flightless bird, fowl,
   fruit-eating bird, fulmar, game bird, guided missile, guy, hen,
   hiss, hoot, insect-eating bird, jasper, joker, lad, migrant,
   migratory bird, minx, missile, nestling, nuclear warhead,
   oscine bird, owl, passerine bird, payload, peacock, peafowl,
   peahen, perching bird, pigeon, pooh, pooh-pooh, ratite, razz,
   rocket, sea bird, seed-eating bird, shore bird, skirt, songbird,
   squab, storm petrel, stormy petrel, stud, swan,
   thermonuclear warhead, tomato, torpedo, wading bird, war rocket,
   warbler, warhead, water bird, waterfowl, wench, wildfowl



Easton's 1897 Bible Dictionary:

Bird
   Birds are divided in the Mosaic law into two classes, (1) the
   clean (Lev. 1:14-17; 5:7-10; 14:4-7), which were offered in
   sacrifice; and (2) the unclean (Lev. 11:13-20). When offered in
   sacrifice, they were not divided as other victims were (Gen.
   15:10). They are mentioned also as an article of food (Deut.
   14:11). The art of snaring wild birds is referred to (Ps. 124:7;
   Prov. 1:17; 7:23; Jer. 5:27). Singing birds are mentioned in Ps.
   104:12; Eccl. 12:4. Their timidity is alluded to (Hos. 11:11).
   The reference in Ps. 84:3 to the swallow and the sparrow may be
   only a comparison equivalent to, "What her house is to the
   sparrow, and her nest to the swallow, that thine altars are to
   my soul."