The Collaborative International Dictionary of English v.0.48:

Manus \Ma"nus\, n.; pl. Manus. [L., the hand.] (Anat.)
   The distal segment of the fore limb, including the carpus and
   fore foot or hand.
   [1913 Webster]

WordNet (r) 3.0 (2006):

manus
    n 1: the (prehensile) extremity of the superior limb; "he had
         the hands of a surgeon"; "he extended his mitt" [syn:
         hand, manus, mitt, paw]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

MANUS. Anciently signified the person taking an oath as a compurgator. The
use of this word probably came from the party laying his hand on the New
Testament. Manus signifies, among the civilians, power, and is frequently
used as synonymous with potestas. Lec. El. Dr. Rom. Sec. 94.