Old English wrist, from Proto-Germanic *wristiz (compare Low German Wrist, German Rist 'back of hand, instep, withers', Swedish vrist), from *wrīþanan 'to twist, turn'. More at writhe.
wrist (plural wrists)
- (anatomy) The complex joint between forearm bones, carpus, and metacarpals where the hand is attached to the arm; the carpus in narrow sense.
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Old English 
Proto-Germanic *wristiz, whence also Old High German *rist, Old Norse rist