τρίσπαστος

ον
A. drawn threefold, τ. ὄργανον a triple pulley, Orib. 49.22.1; so trispastos, Vitr. 10.2.3; μηχανή Tz. H. 2.107.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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