Eohippus Eoghanacht • eolation · · · Info · Definitions · Synonyms · Characters · · Eohippus · · Text Latin · · Script 8 · · Length Definitions · · · (noun) earliest horse; extinct primitive dog-sized four-toed Eocene animal. Synonyms: eohippus, dawn horse. · · Noun Definition 1 Synonyms · · · dawn horse · · Synonym 1 Characters · · E latin capital letter e U+0045 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 s latin small letter s U+0073 u latin small letter u U+0075