methylene blue

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noun Chemistry, Pharmacology.

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.

Nearby words

  1. methylcellulose,
  2. methylcyclohexanol,
  3. methyldopa,
  4. methylene,
  5. methylene azure,
  6. methylene chloride,
  7. methylene dioxyamphetamine,
  8. methylene group,
  9. methylene iodide,
  10. methylglyoxal

Origin of methylene blue

First recorded in 1885–90


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for methylene blue

methylene blue

noun

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

Medicine definitions for methylene blue

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.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for methylene blue

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.