Dephlogistication

Dephlogisticcate De`phlo*gis"tic*cate, v. t. [imp. & p. p. {Dephlogisticated}; p. pr. & vb. n. {Dephlogisticating}.] [Pref. de- + phlosticate: cf. F. d['e]phlogistiguer.] (O. Chem.) To deprive of phlogiston, or the supposed principle of inflammability. --Priestley. [1913 Webster]

{Dephlogisticated air}, oxygen gas; -- so called by Dr. Priestly and others of his time. -- {De`phlo*gis`ti*ca"tion}, n. [1913 Webster]