natural gas

== English == === Etymology === By opposition to coal gas (19th century). === Pronunciation === === Noun === natural gas (countable and uncountable, plural natural gases) A mixture of gaseous hydrocarbons associated with petroleum deposits; mostly methane with smaller amounts of ethane, propane and butane; principally used as a fuel. Synonym: NG (initialism) Hyponyms: CNG, LNG ==== Derived terms ==== ==== Translations ==== ==== See also ==== petroleum gas