Definition: A hypothetical substance of negative mass that, according to the theory of G.E. Stahl, was given off by a substance when it underwent combustion, thus accounting for the decrease in mass of the ash over the original substance; abandoned after the discoveries of Priestley and Lavoisier concerning oxygen.
[G. phlogistos, inflammable]
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.