Tet′ra‐spas″ton (?), n. [NL., fr. Gr. τέτρα- (see Tetra-) + � to draw, pull.] (Mach.) A machine in which four pulleys act together. Brande & C.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.