Source : Webster's Revised Unabridged Dictionary (1913)

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.

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