hard rubber hard roll • hard rush · · · Info · Definitions · Synonyms · Characters · · hard rubber · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) a hard nonresilient rubber formed by vulcanizing natural rubber. Synonyms: hard rubber, vulcanite, ebonite. · · Noun Definition 1 Synonyms · · · vulcanite · · Synonym 1 ebonite · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 r latin small letter r U+0072 u latin small letter u U+0075