from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An asphyxiating mixture of gases, primarily nitrogen and carbon dioxide, left in a mine after a fire or an explosion.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Suffocating gases present in a coal mine after an explosion caused by firedamp, consisting of nitrogen, carbon monoxide, carbon dioxide, and sometimes hydrogen sulfide.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a toxic mixture of gases (including carbon dioxide and carbon monoxide and nitrogen) after an explosion of firedamp in a mine
after + damp, gas.(American Heritage® Dictionary of the English Language, Fourth Edition)
From after- + damp. (Wiktionary)