Pol″y‐spast (?), n. [L. polyspaston, fr. Gr. �, fr. � drawn by several cords; πολύσ many + � to draw: cf. F. polyspaste.] (Surg.) A machine consisting of many pulleys; specifically, an apparatus formerly used for reducing luxations.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.