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Medical Definition of Azure A
1. C14H14N3SCl; asymmetrical dimethylthionine chloride;a blue dye used as a component of MacNeal's tetrachrome blood stain and of Romanowsky-type blood stains; also used as a stain for mucins, nucleic acids, and mast cell granules; gives a metachromatic violet to red colour to highly acidic substances in tissues. (05 Mar 2000)