Noun
dephlogisticated air (uncountable)
(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”). [from 1775]
Synonym: dephlogisticated gas
He did not emphasise his discovery of "dephlogisticated air" (leaving it to Part III of the volume) but instead argued in the preface how important such discoveries were to rational religion. Source: Internet
Many investigators had been experimenting with the combination of Henry Cavendish 's inflammable air, which Lavoisier termed hydrogen ( Greek for "water-former"), with dephlogisticated air (oxygen) by electrically sparking mixtures of the gases. Source: Internet
He showed that this residual air supported neither combustion nor respiration and that approximately five volumes of this air added to one volume of the dephlogisticated air gave common atmospheric air. Source: Internet
In addition to studying Priestley's dephlogisticated air, he studied more thoroughly the residual air after metals had been calcined. Source: Internet