firedamp

• POS: Noun
• HYPHEN: fire=damp

CIDE DICTIONARY

firedamp, n. 

 a mixture of gases (mostly methane) that forms in coal mines and becomes explosive when mixed with air. It is a source of serious hazard in coal mining operations.  [WordNet 1.5]

OXFORD DICTIONARY

firedamp, n. a miners' name for methane, which is explosive when mixed in certain proportions with air.

THESAURUS

firedamp

afterdamp, blackdamp, breath, chokedamp, cloud, coal gas, damp, effluvium, exhalation, exhaust, exhaust gas, fetid air, flatus, fluid, fume, malaria, mephitis, miasma, puff of smoke, reek, smoke, smudge, steam, vapor, volatile, water vapor