(obsolete, chemistry) From which the phlogiston has been removed

simple past tense and past participle of dephlogisticate

present participle of dephlogisticate

Third-person singular simple present indicative form of dephlogisticate

To take away the phlogiston, i.e. ability to burn, which is now understood to be chemically impossible

plural of dephlogistication

(chemistry, obsolete) The process of dephlogisticating; removal of the phlogiston, or supposed ability to burn.

(chemistry, historical) Oxygen gas, as originally thought to be air deprived of phlogiston (“the hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies and to be given up by them in burning”).