a kind of poisonous gas encountered in coal mines.
See also: White
white damp
white damp
[′wīt ‚damp] (mining engineering) In mining, carbon monoxide (CO); a gas that may be present in the afterdamp of a gas or coal-dust explosion, or in the gases given off by a mine fire; it is an important constituent of illuminating gas, supports combustion, and is very poisonous.