iron horse iron heel • iron hydroxide · · · Info · Definitions · Characters · · iron horse · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) (c. 1840) an early term for a locomotive. Synonyms: iron horse. · · Noun Definition 1 Characters · · space U+0020 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073