Source : Webster's Revised Unabridged Dictionary (1913)

Fang \Fang\, n. [From {Fang}, v. t.; cf. AS. fang a taking,
   booty, G. fang.]
   1. (Zo["o]l.) 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.

            Since I am a dog, beware my fangs.    --Shak.

   2. Any shoot or other thing by which hold is taken.

            The protuberant fangs of the yucca.   --Evelyn.

   3. (Anat.) The root, or one of the branches of the root, of a
      tooth. See {Tooth}.

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

   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.

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

   {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.]