exorcize

Verb

 * 1)  To drive out supposed evil spirits from a person, place or thing, especially by an incantation or prayer.
 * 2)  To rid a person, place or thing of an evil spirit.
 * 1)  To rid a person, place or thing of an evil spirit.

Usage notes
Unlike most verbs using the -ise/-ize suffix, exorcise is more commonly spelled with -s- even in American English.