- 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.
Origin of methylene blue
First recorded in 1885–90
Also called methylthionine chloride.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for methylene blue
They can readily be demonstrated in smears stained with Lffler's methylene-blue.
Ingestion of small amounts of methylene-blue gives a pale green; large amounts give a marked blue.
The most promising of the methods which have been devised are cryoscopy, the methylene-blue test, and the phloridzin test.
Effect of freezing procedures on methylene-blue reduction time.Preservation of Bull Semen at Sub-Zero Temperatures
N. L. VanDemark
- 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 OAlso called: methylthionine 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
- 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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.