Source : Webster's Revised Unabridged Dictionary (1913)

Bevel \Bev"el\, n. [C. F. biveau, earlier buveau, Sp. baivel; of
   unknown origin. Cf. {Bevile}.]
   1. Any angle other than a right angle; the angle which one
      surface makes with another when they are not at right
      angles; the slant or inclination of such surface; as, to
      give a bevel to the edge of a table or a stone slab; the
      bevel of a piece of timber.

   2. An instrument consisting of two rules or arms, jointed
      together at one end, and opening to any angle, for
      adjusting the surfaces of work to the same or a given
      inclination; -- called also a {bevel square}. --Gwilt.

Source : WordNet®

bevel square
     n : a hand tool consisting of two rules that are hinged together
         so you can draw or measure angles of any size [syn: {bevel}]