purpurin noun.
['pǝ:pjʊrɪn] M19.[from Latin purpura (see PURPLE adjective & noun) + -IN1.]Chemistry. A red dye orig. extracted from madder and also prepared artificially by the oxidation of alizarin; 1,2,4-trihydroxyanthraquinone, C
14H
8O
5.
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