Liddell-Scott-Jones

ὕπερον (huperon) a pestle ^G:V

ὕπερον, ὁ,

or ὕπερον, τό, see below:— pestle, ὕπερον δὲ τρίπηχυν [Refs 8th c.BC+]; ὑπέρου μοι περιτροπὴ γενήσεται, proverbial of never-ending and ineffectual labour, [Refs 5th c.BC+] the mutilated title of a successful comedy in [Refs]

__II anything shaped like a pestle,
__II.1 club, cudgel, [Refs 1st c.AD+]
__II.2 lever for stretching dislocated joints, [Refs 5th c.BC+]
__III like{πηνίον}, a pupa of a geometrid moth, [Refs 4th c.BC+]—The form ὕπερον, τό, is found in [Refs 5th c.BC+]; whereas none of the other passages in which the word occurs prove anything about the gender, except [Refs 8th c.BC+]; whence it has been suggested that τρίπηχυ should be read there, and ὕπερον, τό, received as the only form.