methanePronunciation: /ˈmiːθeɪn, ˈmɛθeɪn/Translate methane | into German | into Italian | into Spanish Definition of methane noun [mass noun] Chemistry a colourless, odourless flammable gas which is the main constituent of natural gas. It is the simplest member of the alkane series of hydrocarbons. Chemical formula: CH4 Origin: mid 19th century: from methyl + -ane2methane in other Oxford dictionaries Definition of methane in the US English dictionary
