Source : Webster's Revised Unabridged Dictionary (1913)

Theosophic \The`o*soph"ic\, Theosophical \The`o*soph"ic*al\, a.
   [Cf. F. th['e]osophique.]
   Of or pertaining to theosophy. -- {The`o*soph"ic*al*ly}, adv.

Source : WordNet®

theosophical
     adj : of or relating to theosophy; "theosophical writings"