noun, Chemistry, Pharmacology.
a dark-green, crystalline compound, C 1 6 H 1 8 ClN 3 S, that dissolves in water to form a deep-blue solution: used chiefly as a dye, as a bacteriological and biological stain, and as an antidote for cyanide poisoning.
a dark-green crystalline compound forming a blue aqueous solution, used as a mild antiseptic and biological stain. Formula: C16H18N3SCl.3H2O Also called methylthionine chloride

methylene blue n.
A basic aniline dye that forms a deep blue solution when dissolved in water and is used as a bacteriological stain and as an antidote for cyanide poisoning.
methylene blue
A basic dye that forms a deep blue solution when dissolved in water. It is used as an antidote for cyanide poisoning and as a bacteriological stain. Chemical formula: C16H18N3SCl.


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