/ Dictionary / Index A afterdamp: Meaning and Definition of Find definitions for: af•ter•damp Pronunciation: (af'tur-damp", äf'-), [key] — n. an irrespirable mixture of gases, consisting chiefly of carbon dioxide and nitrogen, left in a mine after an explosion or fire. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: afterdamp (Thesaurus) aftercooler afterdeck Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language