The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   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.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bevel square
    n 1: a hand tool consisting of two rules that are hinged
         together so you can draw or measure angles of any size
         [syn: bevel, bevel square]