【医】 腕阵挛

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.]
1. (Anat.) The joint, or the region of the joint, between the
hand and the arm; the carpus. See {Carpus}.

He took me by the wrist, and held me hard. --Shak.

2. (Mach.) A stud or pin which forms a journal; -- also
called {wrist pin}.

{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.