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methane

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meth⋅ane

[meth-eyn; Brit. mee-theyn]
–noun Chemistry.
a colorless, odorless, flammable gas, CH4, the main constituent of marsh gas and the firedamp of coal mines, obtained commercially from natural gas: the first member of the methane, or alkane, series of hydrocarbons.

Origin:
1865–70; meth- + -ane
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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meth·ane   (měth'ān')   
n.  An odorless, colorless, flammable gas, CH4, the major constituent of natural gas, that is used as a fuel and is an important source of hydrogen and a wide variety of organic compounds.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

methane 
1868, coined from meth(yl) + chemical suffix -ane.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: meth·ane
Pronunciation: 'meth-"An, Brit usu 'mE-"thAn
Function: noun
: a colorless odorless flammable gaseous saturated hydrocarbonCH4 that is lighter than air and forms explosive mixtures with air or oxygen, that is a product of decomposition of organic matter in marshes and mines or of the carbonization of coal, andthat is used as a fuel and raw material in chemical synthesis called also marsh gas
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

methane meth·ane (měth'ān')
n.
An odorless, colorless, flammable gas that is the major constituent of natural gas and is used as a fuel and as an important source of hydrogen. Also called marsh gas.

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