methane

noun

meth·​ane ˈme-ˌthān 

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

Powered by liquid oxygen and methane, Deneb has a thrust of 15,000 pounds. — Eric Berger, ArsTechnica, 9 July 2026

The world is still not reducing fossil fuel use, industrial emissions, methane, and flaring quickly enough to bend the global emissions curve downward. — Robert Rapier, Forbes.com, 5 July 2026

Titan comes with a thick atmosphere and is a distinctive world of clouds, rain, rivers, lakes and seas of liquid hydrocarbons like methane and ethane. — Leonard David, Space.com, 3 July 2026

The Yolo County Central Landfill will build a new system that will convert methane from decomposing waste into renewable natural gas, the county announced Tuesday. — Daniel Lempres, Sacbee.com, 30 June 2026

Word History

Etymology

International Scientific Vocabulary

First Known Use

1867, in the meaning defined above

Rhymes for methane

• abstain
• airplane
• alkane
• arcane
• arraign
• attain
• backplane
• betaine
• biplane
• blockchain
• butane
• campaign

Kids Definition

methane

noun

meth·​ane ˈmeth-ˌān 

: 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