The Collaborative International Dictionary of English v.0.48:
Theurgic \The*ur"gic\, Theurgical \The*ur"gic*al\, a. [L. theurgicus, Gr. ?: cf. F. th['e]urgique.] Of or pertaining to theurgy; magical. [1913 Webster] Theurgic hymns, songs of incantation. [1913 Webster]