biogas

[bahy-oh-gas]
noun
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.
Also, bio-gas.


Origin:
1970–75; bio- + gas

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
biogas (ˈbaɪəʊˌɡæs)
 
n
a gas that is produced by the action of bacteria on organic waste matter: used as a fuel

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
biogas   (bī'ō-gās')  Pronunciation Key 
See under biofuel.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Many small scale livestock farms hesitate to invest in biogas facilities
  because they cannot meet the minimum scale.
The generators can be powered by biogas extracted from cow manure.
The only well-established process for this is the biogas generation, that
  generates significant additional revenue for farmers.
The article already says that on-shore wind power, biogas and new natural gas
  plants are cheaper than new nuclear power plants.
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