πλήμνη

A. nave of a wheel, Il. 5.726, 23.339, Hes. Sc. 309, Hp. Fract. 13; ἄξονος ἐν πλήμνησι A.R. 1.757. (Perh. from πλήθω, the filled up or solid part of the wheel.)
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project