The Collaborative International Dictionary of English v.0.48:

Strap \Strap\, n. [OE. strope, AS. stropp, L. stroppus,
   struppus, perhaps fr. Gr. ? a band or cord, fr. ? to twist,
   to turn (cf. Strophe). Cf. Strop a strap, a piece of
   rope.]
   1. A long, narrow, pliable strip of leather, cloth, or the
      like; specifically, a strip of thick leather used in
      flogging.
      [1913 Webster]

            A lively cobbler that . . . had scarce passed a day
            without giving her [his wife] the discipline of the
            strap.                                --Addison.
      [1913 Webster]

   2. Something made of such a strip, or of a part of one, or a
      combination of two or more for a particular use; as, a
      boot strap, shawl strap, stirrup strap.
      [1913 Webster]

   3. A piece of leather, or strip of wood covered with a
      suitable material, for sharpening a razor; a strop.
      [1913 Webster]

   4. A narrow strip of anything, as of iron or brass.
      Specifically:
      [1913 Webster]
      (a) (Carp. & Mach.) A band, plate, or loop of metal for
          clasping and holding timbers or parts of a machine.
          [1913 Webster]
      (b) (Naut.) A piece of rope or metal passing around a
          block and used for fastening it to anything.
          [1913 Webster]

   5. (Bot.)
      (a) The flat part of the corolla in ligulate florets, as
          those of the white circle in the daisy.
      (b) The leaf, exclusive of its sheath, in some grasses.
          [1913 Webster]

   6. A shoulder strap. See under Shoulder.
      [1913 Webster]

   Strap bolt, a bolt of which one end is a flat bar of
      considerable length.

   Strap head (Mach.), a journal box, or pair of brasses,
      secured to the end of a connecting rod by a strap. See
      Illust. of Gib and key, under Gib.

   Strap hinge, a hinge with long flaps by which it is
      fastened, as to a door or wall.

   Strap rail (Railroads), a flat rail formerly used.
      [1913 Webster]

WordNet (r) 3.0 (2006):

strap hinge
    n 1: a hinge with two long straps; one strap is fastened to the
         surface of a moving part (e.g., a door or lid) and the
         other is fastened to the adjacent stationary frame [syn:
         strap hinge, joint hinge]