three-year-old three-year • three-year-old horse · · · Info · Definitions · Synonyms · Characters · · three-year-old · · Text Common · · Latin · · Scripts 14 · · Length 4 · · Syllables Definitions · · · (noun) a racehorse that is three years old. Synonyms: three-year-old horse, three year old. · · Noun Definition 1 (adj) three years of age. · · Adjective Definition 1 Synonyms · · · three-year-old horse · · Synonym 1 three year old · · Synonym 2 Characters · · - 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 t latin small letter t U+0074 y latin small letter y U+0079