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

The company says future systems could potentially capture gases such as methane and hydrogen and feed them into other food-production processes. — New Atlas, 3 Oct. 2026

This has also been seen from orbit many times in photos from the International Space Station and, in fact, was seen by the Cassini spacecraft at Saturn when sunlight reflected off lakes of liquid methane on its huge moon Titan. — Phil Plait, Scientific American, 2 Oct. 2026

With methane—a potent greenhouse gas—ousted from the atmosphere, and the creation of the UV-protective ozone layer (which still shields us from the sun’s rays today), the Earth began to cool and experienced one of its earliest ice ages. — Literary Hub, 2 Oct. 2026

Both the book and the movie get surreal at a certain point, as the methane poisoning sets in. — Lexy Perez, HollywoodReporter, 2 Oct. 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