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Webster 1913 Edition

Noun.

One addicted to theosophy.

The

theosophist

is one who gives you a theory of God, or of the works of God, which has not reason, but an inspiration of his own, for its basis.

R. A. Vaughan.

Noun.

One who pretends to divine illumination; one who pretends to derive his knowledge from divine revelation.

theosophist ‎(plural theosophists)

an advocate of, or believer in theosophy.
- 1662, More, Henry, “A brief discourse of the nature, causes, kinds, and cure of enthusiasm”, in A collection of several philosophical writings, 2nd edition, London: Flesher, page 30, or, § xliv:
  What can it be but the heaving of the Hypochondria that lifts up the Mind to such high comparisons from a supposition so false and foolish? But I have observed generally of Chymists^[sic] and Theosophists, as of feveral other men more palpably mad, that their thoughts are carried much to Astrology, it being a fancifull study built upon very slight grounds, and indeed I do not queftion, but a relique of the ancient superstition and Idolatry amongst the rude Heathens, which either their own Melancholy, or something worse, instructed them in.
- For more examples of usage of this term, see Citations:theosophist.

an advocate of, or believer in theosophy