Sulph‐in′di‐got″ic (?), a.(Chem.) Of, pertaining to, or designating, a sulphonic acid obtained, as a blue solution, by dissolving indigo in sulphuric acid; — formerly called also cerulic sulphuric acid, but properly called indigo-disulphonic acid.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.