Firedamp

noun

Definitions

Noun
  1. 1
    A flammable gas (mostly methane) found in coal mines; forms an explosive mixture with air. uncountable, usually
  2. 2
    a mixture of gases (mostly methane) that form in coal mines and become explosive when mixed with air wordnet

Etymology

From fire + damp with 'damp' not in the usual sense of 'moist' but old German, modern Dutch, Danish 'damp' as steam or vapour, hence a gas liable to catch fire.

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