The Collaborative International Dictionary
Polyspast
Polyspast \Pol"y*spast\, n. [L. polyspaston, fr. Gr. ?, fr. ? drawn by several cords; poly`s many + ? to draw: cf. F. polyspaste.] (Surg.) A machine consisting of many pulleys; specifically, an apparatus formerly used for reducing luxations.
Wiktionary
polyspast
n. 1 A machine consisting of many pulleys 2 (context surgical English) A machine of many pulleys, formerly used to reduce dislocation 3 (context mechanics English) A windlass with many pulley and truckles