a colorless, odorless, flammable, gaseous alkane, CH, present in natural gas and formed by the decomposition of vegetable matter, as in marshes and mines, or produced artificially by heating carbon monoxide and hydrogen: it is the simplest alkane and is used as a fuel, a source of carbon black, etc.
Origin of methanemeth(yl) + -ane
An odorless, colorless, flammable gas, CH4, the major constituent of natural gas, that is used as a fuel and is an important source of hydrogen and a wide variety of organic compounds.
(countable and uncountable, plural methanes)
From methyl + -ane.