rock wool rockwood • rockwork · · · Info · Definitions · Synonyms · Characters · · rock wool · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) a light fibrous material used as an insulator. Synonyms: mineral wool, rock wool. · · Noun Definition 1 Synonyms · · · mineral wool · · Synonym 1 Characters · · space U+0020 c latin small letter c U+0063 k latin small letter k U+006B l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072 w latin small letter w U+0077