The Collaborative International Dictionary of English v.0.48:

Wrist \Wrist\, n. [OE. wriste, wrist, AS. wrist; akin to OFries.
   wriust, LG. wrist, G. rist wrist, instep, Icel. rist instep,
   Dan. & Sw. vrist, and perhaps to E. writhe.]
   [1913 Webster]
   1. (Anat.) The joint, or the region of the joint, between the
      hand and the arm; the carpus. See Carpus.
      [1913 Webster]

            He took me by the wrist, and held me hard. --Shak.
      [1913 Webster]

   2. (Mach.) A stud or pin which forms a journal; -- also
      called wrist pin.
      [1913 Webster]

   Bridle wrist, the wrist of the left hand, in which a
      horseman holds the bridle.

   Wrist clonus. [NL. clonus, fr. Gr. ?. See Clonic.] (Med.)
      A series of quickly alternating movements of flexion and
      extension of the wrist, produced in some cases of nervous
      disease by suddenly bending the hand back upon the
      forearm.

   Wrist drop (Med.), paralysis of the extensor muscles of the
      hand, affecting the hand so that when an attempt is made
      to hold it out in line with the forearm with the palm
      down, the hand drops. It is chiefly due to plumbism.
      Called also hand drop.

   Wrist plate (Steam Engine), a swinging plate bearing two or
      more wrists, for operating the valves.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wrist
    n 1: a joint between the distal end of the radius and the
         proximal row of carpal bones [syn: wrist, carpus,
         wrist joint, radiocarpal joint, articulatio
         radiocarpea]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "wrist":
   ankle, arm, articulation, biceps, boundary, butt, cervix, clinch,
   closure, connecting link, connecting rod, connection, coupling,
   dovetail, elbow, embrace, forearm, gliding joint, hinge,
   hinged joint, hip, interface, join, joining, joint, juncture, knee,
   knuckle, link, miter, mortise, neck, pivot, pivot joint, rabbet,
   scarf, seam, shoulder, stitch, suture, symphysis, tie rod, toggle,
   toggle joint, union, upper arm, weld