Source : Webster's Revised Unabridged Dictionary (1913)

Exorcise \Ex"or*cise\ ([e^]ks"[o^]r*s[imac]z), v. t. [imp. & p.
   p. {Exorcised} (-s[imac]zd); p. pr. & vb. n. {Exorcising}
   (-s[imac]`z[i^]ng).] [L. exorcizare, Gr. 'exorki`zein; 'ex
   out + "orki`zein to make one swear, bind by an oath, fr.
   "o`rkos oath: cf. F. exorciser.]
   1. To cast out, as a devil, evil spirits, etc., by
      conjuration or summoning by a holy name, or by certain
      ceremonies; to expel (a demon) or to conjure (a demon) to
      depart out of a person possessed by one.

            He impudently excorciseth devils in the church.
                                                  --Prynne.

   2. To deliver or purify from the influence of an evil spirit
      or demon.

            Exorcise the beds and cross the walls. --Dryden.

            Mr. Spectator . . . do all you can to exorcise
            crowds who are . . . processed as I am. --Spectator.