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.
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   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.
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   2. Any shoot or other thing by which hold is taken.
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            The protuberant fangs of the yucca.   --Evelyn.
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   3. (Anat.) The root, or one of the branches of the root, of a
      tooth. See Tooth.
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   4. (Mining) A niche in the side of an adit or shaft, for an
      air course. --Knight.
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   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.
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   6. (Naut.)
      (a) The valve of a pump box.
      (b) A bend or loop of a rope.
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   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