onocentaur
/ˌɒnə(ʊ)ˈsɛntɔː/Greek Mythol.
noun
A centaur with the lower body and legs of an ass, rather than those of a horse.
Origin
Early 16th century; earliest use found in John Skelton (c1460–1529), poet. From post-classical Latin onocentaurus (Vetus Latina) from Hellenistic Greek ὀνοκένταυρος (Septuagint) from ancient Greek ὄνος ass + κένταυρος.