firedamp

Etymology
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

Noun

 * 1)  An inflammable gas (mostly methane) found in coal mines; forms an explosive mixture with air.

Translations

 * Bulgarian: рудничен газ, газ-гризу
 * Catalan:
 * Dutch:
 * Esperanto: grizuo
 * Finnish: kaivoskaasu
 * French:
 * German: Grubengas
 * Hungarian:
 * Italian: grisou
 * Macedonian: ру́днички гас
 * Portuguese: grisu
 * Romanian:
 * Spanish:
 * Swedish: gruvgas
 * Turkish:
 * Welsh: llosgnwy