Blackdamp
ahd-5
noun.
A noncombustible gas that consists of a mixture of carbon dioxide and nitrogen, found in mines after fires or explosions and incapable of supporting life.
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noun.
choke damp
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life