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methylene blue

noun

, Chemistry, Pharmacology.
  1. 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.


methylene blue

noun

  1. a dark-green crystalline compound forming a blue aqueous solution, used as a mild antiseptic and biological stain. Formula: C 16 H 18 N 3 SCl.3H 2 O Also calledmethylthionine chloride
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


methylene blue

  1. 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: C 16 H 18 N 3 SCl.


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Word History and Origins

Origin of methylene blue1

First recorded in 1885–90
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Example Sentences

The most promising of the methods which have been devised are cryoscopy, the methylene-blue test, and the phloridzin test.

Counterstain in methylene blue, aqueous solution thirty seconds.

Counterstain with Kuehne's carbolic methylene-blue for one or two minutes.

Stain carbolic methylene-blue, carbolic fuchsin, and Gram's method.

From the resulting growths make cover-slip preparations and stain carbolic methylene-blue, Neisser's method, Gram's method.

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methylenemethylene chloride