methylene blue definition

  • noun:
    • A basic aniline dye, C16H18N3SCl · 3H2O, that forms a deep blue solution when dissolved in water. It is used as an antidote for cyanide poisoning and a bacteriological stain.
    • A heterocyclic aromatic chemical element with several utilizes in biology and chemistry.
    • an artificial dyestuff comprising a complex sulphur by-product of diphenyl amine; -- labeled as additionally pure blue.
    • a dark green dye used as a stain, an antiseptic, a chemical indicator, and an antidote in cyanide poisoning

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