dephlogisticated air

/D EH1 F L AH0 JH IH1 S T IH0 K EY0 T IH0 D EH0 R/
noun
  1. 1

    (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”).

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