/ Dictionary / Index M methane: Meaning and Definition of Find definitions for: meth•ane Pronunciation: (meth'ānBrit.mē'thān), [key] — n. Chem. a colorless, odorless, flammable gas, CH, the main constituent of marsh gas and the firedamp of coal mines, obtained commercially from natural gas: the first member of the methane, or alkane, series of hydrocarbons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: methane (Thesaurus) methanation methane series Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language