Ce‐ru″le‐in (?), n. [L. caeruleus sky-blue.] (Chem.) A fast dyestuff, C20H8O6, made by heating gallein with strong sulphuric acid. It dyes mordanted fabrics green.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.