καρυδόω
From LSJ
τραχὺς ἐντεῦθεν μελάμπυγός τε τοῖς ἐχθροῖς ἅπασιν → he is a tough black-arse towards his enemies, he is a veritable Heracles towards his enemies
English (LSJ)
A castrate a horse, and καρύδωσις, εως, ἡ, castration, Hippiatr.99.
German (Pape)
[Seite 1331] ein Pferd kastriren, u. καρύδωσις, ἡ, das Verschneiden, Hippiatr.
Greek (Liddell-Scott)
καρυδόω: εὐνουχίζω ἵππον, καρύδωσις, εως, ἡ, εὐνουχισμός, Ἱππιατρ. 239, 33.