Added 9 October 2026 methane /ˈmiːθeɪn/ noun Categories: NatureUncommon Words In Latin: methanum Wiktionary noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about methane at Wordnik → Where our words come from → A colorless odorless gas used as a fuel. Related Words: methanoldiphenylsulphidegascmmch4producingfiredamp Back to today's word