methane

meth·ane   (měth'ān')    n.  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.

methane 

Main Entry: meth·ane
Pronunciation: 'meth-"An, Brit usu 'mE-"thAn
Function: noun
: a colorless odorless flammable gaseous saturated hydrocarbonCH₄ that is lighter than air and forms explosive mixtures with air or oxygen, that is a product of decomposition of organic matter in marshes and mines or of the carbonization of coal, andthat is used as a fuel and raw material in chemical synthesis called also marsh gas

methane meth·ane (měth'ān')
n.
An odorless, colorless, flammable gas that is the major constituent of natural gas and is used as a fuel and as an important source of hydrogen. Also called marsh gas.

methane   (měth'ān')  Pronunciation Key  A colorless, odorless, flammable gas that is the simplest hydrocarbon. It is the major constituent of natural gas and is released during the decomposition of plant or other organic compounds, as in marshes and coal mines. Methane is the first member of the alkane series. Chemical formula: CH4.