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

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.

Word History and Origins

Origin of methylene blue¹

First recorded in 1885–90

Example Sentences

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

From Project Gutenberg

Counterstain in methylene blue, aqueous solution thirty seconds.

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg