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Definition of marsh gas noun from the Oxford Advanced Learner's Dictionary

marsh gas

noun
 
/ˈmɑːʃ ɡæs/
 
/ˈmɑːrʃ ɡæs/
[uncountable]
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  1. the gas methane, especially when it is produced in a marsh when plants decay (= become destroyed by natural processes)
See marsh gas in the Oxford Advanced American Dictionary
trait
noun
 
 
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