NOUN (4)

1. a Bantu language spoken in Cameroon;

2. an appendage of insects that is capable of injecting venom; usually evolved from the legs;

3. canine tooth of a carnivorous animal; used to seize and tear its prey;

4. hollow or grooved tooth of a venomous snake; used to inject its poison;

The Collaborative International Dictionary of English v.0.48:

Fang \Fang\ (f[a^]ng), v. t. [OE. fangen, fongen, fon (g orig.
   only in p. p. and imp. tense), AS. f[=o]n; akin to D. vangen,
   OHG. f[=a]han, G. fahen, fangen, Icel. f[=a], Sw. f[*a],
   f[*a]nga, Dan. fange, faae, Goth. fahan, and prob. to E.
   fair, peace, pact. Cf. Fair, a.]
   1. To catch; to seize, as with the teeth; to lay hold of; to
      gripe; to clutch. [Obs.] --Shak.
      [1913 Webster]

            He's in the law's clutches; you see he's fanged.
                                                  --J. Webster.
      [1913 Webster]

   2. To enable to catch or tear; to furnish with fangs.
      "Chariots fanged with scythes." --Philips.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fang \Fang\, n. [From Fang, v. t.; cf. AS. fang a taking,
   booty, G. fang.]
   1. (Zool.) The tusk of an animal, by which the prey is seized
      and held or torn; a long pointed tooth; esp., one of the
      usually erectile, venomous teeth of serpents. Also, one of
      the falcers of a spider.
      [1913 Webster]

            Since I am a dog, beware my fangs.    --Shak.
      [1913 Webster]

   2. Any shoot or other thing by which hold is taken.
      [1913 Webster]

            The protuberant fangs of the yucca.   --Evelyn.
      [1913 Webster]

   3. (Anat.) The root, or one of the branches of the root, of a
      tooth. See Tooth.
      [1913 Webster]

   4. (Mining) A niche in the side of an adit or shaft, for an
      air course. --Knight.
      [1913 Webster]

   5. (Mech.) A projecting tooth or prong, as in a part of a
      lock, or the plate of a belt clamp, or the end of a tool,
      as a chisel, where it enters the handle.
      [1913 Webster]

   6. (Naut.)
      (a) The valve of a pump box.
      (b) A bend or loop of a rope.
          [1913 Webster]

   In a fang, fast entangled.

   To lose the fang, said of a pump when the water has gone
      out; hence:

   To fang a pump, to supply it with the water necessary to
      make it operate. [Scot.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

Fang
    n 1: a Bantu language spoken in Cameroon
    2: an appendage of insects that is capable of injecting venom;
       usually evolved from the legs
    3: canine tooth of a carnivorous animal; used to seize and tear
       its prey
    4: hollow or grooved tooth of a venomous snake; used to inject
       its poison

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "fang":
   baby tooth, beesting, bicuspid, bucktooth, canine, claws, clutches,
   cog, comb, crag, crown, cuspid, cutter, dart, deciduous tooth,
   dent, denticle, denticulation, dentil, dentition, digits, dogtooth,
   eyetooth, fangs, fingernails, fingers, fore tooth, gagtooth,
   gang tooth, gold tooth, grinder, hands, harrow, hooks, incisor,
   jag, jaws, mandibles, maxillae, meathooks, milk tooth, mitts,
   molar, nails, nippers, palm, peak, pecten, peg, permanent tooth,
   pincers, pivot tooth, pounces, premolar, projection, rake, ratchet,
   sawtooth, scrivello, snag, snaggle, snaggletooth, snakebite, spire,
   sprocket, spur, steeple, sting, stinger, talons, tang, teeth,
   tooth, tush, tusk, unguals, ungulae, wisdom tooth