(chemistry, historical) The hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies and to be given up by them in burning.

Of or pertaining to phlogiston or the theory of phlogiston.

plural of phlogiston

(chemistry, historical) The phlogiston theory.

(chemistry) An obsolete scientific theory of combustion.

(chemistry) An early chemist who studied the presumed material phlogiston.

plural of phlogistonist