Source : Webster's Revised Unabridged Dictionary (1913)

Trophonian \Tro*pho"ni*an\, a. [L. Trophonianus, fr. Trophonius,
   Gr. ?, a Grecian architect, fabled to have been the builder
   of the first temple of Apollo at Delphi. He was worshiped
   after death, and had a celebrated oracle in a cave in
   B[oe]otia.]
   Of or pertaining to Trophonius, his architecture, or his cave
   and oracle.