The Collaborative International Dictionary of English v.0.48:

Oratorian \Or`a*to"ri*an\, a.
   Oratorical. [Obs.] --R. North.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Oratorian \Or`a*to"ri*an\, n. [Cf. F. oratorien.] (R. C. Ch.)
   See Fathers of the Oratory, under Oratory.
   [1913 Webster]