περιτρόχιον

τό
A. wheel revolving round an axle, ὁ ἄξων ἐν τῷ περιτροχίῳ the wheel and axle, Papp. 1060.9, cf. Tz. H. 11.607.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project