methane

noun

meth·​ane ˈme-ˌthān How to pronounce methane (audio)
British usually ˈmē-
: a colorless odorless flammable gaseous hydrocarbon CH4 that is a product of biological decomposition of organic matter and of the carbonization of coal, is used as a fuel and as a starting material in chemical synthesis, and is the simplest of the alkanes

Examples of methane in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Babis wants European leaders to reconsider the timing of implementing a landmark EU regulation tackling methane emissions in fossil fuel imports, according to a letter published on the Czech government website. Ewa Krukowska, Bloomberg, 21 Apr. 2026 In addition, Vermont has the lowest carbon dioxide emissions per capita and the third-lowest methane emissions. Stacey Leasca, Travel + Leisure, 19 Apr. 2026 Funds could support methane abatement, infrastructure to ameliorate floods and rising temperatures, and assistance for regions dependent on fossil fuels — without waiting decades for litigation to wind through the courts. Nicolas S. Rohatyn, Mercury News, 16 Apr. 2026 An satellite analysis of 12 urban areas, including New York City and Los Angeles, found up to 80% more methane emissions than previously thought, according to ABC reporter Julia Jacobo. Tony Briscoe, Los Angeles Times, 16 Apr. 2026 See All Example Sentences for methane

Word History

Etymology

International Scientific Vocabulary

First Known Use

1867, in the meaning defined above

Time Traveler
The first known use of methane was in 1867

Cite this Entry

“Methane.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/methane. Accessed 23 Apr. 2026.

Kids Definition

methane

noun
meth·​ane ˈmeth-ˌān How to pronounce methane (audio)
: a colorless odorless flammable gas that consists of carbon and hydrogen and is produced by decay of organic matter

Medical Definition

methane

noun
meth·​ane
ˈmeth-ˌān, British usually ˈmē-ˌthān
: a colorless, odorless, flammable, gaseous hydrocarbon CH4 that is lighter than air, forms explosive mixtures with air or oxygen, and occurs naturally as a by-product of the decomposition of organic matter by anaerobic bacteria

called also marsh gas

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