[meth-uh-luh-meen, -uh l-am-in]

noun Chemistry.

any of three derivatives of ammonia in which one or all of the hydrogen atoms are replaced by methyl groups, especially a gas, CH5N, with an ammonialike odor, the simplest alkyl derivative of ammonia and, like the latter, forming a series of salts.

Nearby words

  1. methyl transferase,
  2. methyl violet,
  3. methyl-,
  4. methylacetic acid,
  5. methylal,
  6. methylate,
  7. methylated spirits,
  8. methylation,
  9. methylbenzene,
  10. methylbenzyl acetate

Origin of methylamine

First recorded in 1840–50; methyl- + amine

Also called monomethylamine. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for methylamine

British Dictionary definitions for methylamine



a colourless flammable water-soluble gas, used in the manufacture of herbicides, dyes, and drugs. Formula: CH 3 NH 2
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

Science definitions for methylamine


[mĕth′ə-lə-mēn, -lămēn, mə-thĭlə-mēn′]

A toxic, flammable gas produced naturally by the decomposition of organic matter and also made synthetically. It is used as a solvent and in the manufacture of many products, such as dyes and insecticides. Chemical formula: CH5N.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.