three-year-old horse three-year-old • thremmatology · · · Info · Definitions · Synonyms · Characters · · three-year-old horse · · Text Common · · Latin · · Scripts 20 · · Length 5 · · Syllables Definitions · · · (noun) a racehorse that is three years old. Synonyms: three-year-old horse, three year old. · · Noun Definition 1 Synonyms · · · three year old · · Synonym 1 Characters · · space U+0020 - hyphen-minus U+002D a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079