humic shale humic acid • humic substance · · · Info · Definitions · Characters · · humic shale · · Text Common · · Latin · · Scripts 11 · · Length 4 · · Syllables Definitions · · · (noun) shale that is rich in humic acids. Synonyms: humic shale. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D s latin small letter s U+0073 u latin small letter u U+0075