clastic rock clastic • clat · · · Info · Definitions · Characters · · clastic rock · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) (geology) a rock composed of broken pieces of older rocks. Synonyms: clastic rock. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 i latin small letter i U+0069 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 s latin small letter s U+0073 t latin small letter t U+0074