afterdamp definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an asphyxiating mixture of gases remaining in a mine after a fire or an explosion of firedamp, usually consisting mostly of nitrogen and carbon dioxide
afterdamp definition by American Heritage Dictionary
An asphyxiating mixture of gases, primarily nitrogen and carbon dioxide, left in a mine after a fire or an explosion.
Origin: after + damp, gas.