fire-damp

firedamp

[fahyuhr-damp]
noun Mining.
1.
a combustible gas consisting chiefly of methane, formed especially in coal mines, and dangerously explosive when mixed with certain proportions of atmospheric air.
2.
the explosive mixture itself.

Origin:
1670–80; fire + damp

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World English Dictionary
firedamp (ˈfaɪəˌdæmp)
 
n
See also afterdamp a mixture of hydrocarbons, chiefly methane, formed in coal mines. It forms explosive mixtures with air

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