[bahy-oh-gas] 
| any gas fuel derived from the decay of organic matter, as the mixture of methane and carbon dioxide produced by the bacterial decomposition of sewage, manure, garbage, or plant crops. |
| bi·o·gas (bī'ō-gās') n. A mixture of methane and carbon dioxide produced by bacterial degradation of organic matter and used as a fuel. |
| biogas (bī'ō-gās') Pronunciation Key
See under biofuel. |
oʊˌgæs