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From The Collaborative International Dictionary of English v.0.48:
Undevil \Un*dev"il\, v. t. [1st pref. un- + devil.] To free from possession by a devil or evil spirit; to exorcise. [Obs.] [1913 Webster] They boy having gotten a habit of counterfeiting . . . would not be undeviled by all their exorcisms. --Fuller. [1913 Webster]