protohippus protoheresiarch • protohistorian · · · Info · Definitions · Characters · · protohippus · · Text Latin · · Script 11 · · Length 4 · · Syllables Definitions · · · (noun) Pliocene horse approaching donkeys in size. · · Noun Definition 1 Characters · · h latin small letter h U+0068 i latin small letter i U+0069 o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075