The Collaborative International Dictionary of English v.0.48:

Hip \Hip\, n. [OE. hipe, huppe, AS. hype; akin to D. heup, OHG.
   huf, G. h["u]fte, Dan. hofte, Sw. h["o]ft, Goth. hups; cf.
   Icel. huppr, and also Gr. ? the hollow above the hips of
   cattle, and Lith. kumpis ham.]
   [1913 Webster]
   1. The projecting region of the lateral parts of one side of
      the pelvis and the hip joint; the haunch; the huckle.
      [1913 Webster]

   2. (Arch.) The external angle formed by the meeting of two
      sloping sides or skirts of a roof, which have their wall
      plates running in different directions.
      [1913 Webster]

   3. (Engin) In a bridge truss, the place where an inclined end
      post meets the top chord. --Waddell.
      [1913 Webster]

   Hip bone (Anat.), the innominate bone; -- called also
      haunch bone and huckle bone.

   Hip girdle (Anat.), the pelvic girdle.

   Hip joint (Anat.), the articulation between the thigh bone
      and hip bone.

   Hip knob (Arch.), a finial, ball, or other ornament at the
      intersection of the hip rafters and the ridge.

   Hip molding (Arch.), a molding on the hip of a roof,
      covering the hip joint of the slating or other roofing.

   Hip rafter (Arch.), the rafter extending from the wall
      plate to the ridge in the angle of a hip roof.

   Hip roof, Hipped roof (Arch.), a roof having sloping ends
      and sloping sides. See Hip, n., 2., and Hip, v. t., 3.


   Hip tile, a tile made to cover the hip of a roof.

   To catch upon the hip, or To have on the hip, to have or
      get the advantage of; -- a figure probably derived from
      wresting. --Shak.

   To smite hip and thigh, to overthrow completely; to defeat
      utterly. --Judg. xv. 8.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hip joint
    n 1: the ball-and-socket joint between the head of the femur and
         the acetabulum [syn: hip, hip joint, coxa,
         articulatio coxae]