methane
n. uncountable B2 Upper Intermediate US //ˈmɛˌθeɪn// UK //mˈiːθeɪn// meth·ane
n. a colourless gas that burns easily. It is the main part of natural gas and is released by cows, landfills, and melting ice.
n. a simple hydrocarbon gas (CH4) that is the primary constituent of natural gas and a potent greenhouse gas emitted by biological and geological processes.
Cows produce methane when they digest grass.
The factory released methane into the air during the repair work.
Scientists worry that warming oceans will release trapped methane, which would speed up climate change even more.
From methyl + -ane.