Also proposed is Ancient Greek καβάλλης (kabállēs, “nag”), in turn possibly a borrowing from a Balkan, Anatolian, or north-east European language. Compare Russian кобыла (kobyla), and Serbo-Croatian кобила/kobila (“mare”).
In Classical Latin, the word equus is used for a horse, and caballus is used only by the poets. It's only later, in Vulgar and Late Latin, that caballus appears in prose.
- Origins, by Eric Partridge, page 85
- ^ Delamare 2003 p.96
- ^ The Origin of Language and Nations, by Rowland Jones page 151