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[meth-am-fet-uh-meen, -min] /ˌmɛθ æmˈfɛt əˌmin, -mɪn/
noun, Pharmacology
a central nervous system stimulant, C 1 0 H 1 5 N, used clinically in the treatment of narcolepsy, hyperkinesia, and for blood pressure maintenance in hypotensive states: also widely used as an illicit drug.
Origin of methamphetamine
1945-50; meth- + amphetamine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for methamphetamine


a variety of amphetamine used for its stimulant action
Word Origin
C20: from meth- + amphetamine
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
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Word Origin and History for methamphetamine

1949, from methyl + amphetamine; so called because it was a methyl derivative of amphetamine.

Online Etymology Dictionary, © 2010 Douglas Harper
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methamphetamine in Science
  (měth'ām-fět'ə-mēn', -mĭn)   
An amine derivative of amphetamine, C10H15N, used in the form of its crystalline hydrochloride both as a central nervous system stimulant in the medical treatment of obesity and attention deficit hyperactivity disorder and illicitly as a recreational drug.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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