Meaning of METHANE in English

me ‧ thane /ˈmiːθeɪn $ ˈme-/ BrE AmE noun [uncountable]

[ Date: 1800-1900 ; Origin: methyl ]

a gas that you cannot see or smell, which can be burned to give heat:

Methane is one of the principal gases contributing to the greenhouse effect.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.