meth'ylene blue'

Chem., Pharm.
a dark-green, crystalline compound, C16H18ClN3S, 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. Also called methylthionine chloride.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

methylenemethylene chloride
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