Source : Webster's Revised Unabridged Dictionary (1913)

Stentorophonic \Sten`to*ro*phon"ic\, a. [Gr. ? Stentor + ? a
   sound, voice. See {Stentor}.]
   Speaking or sounding very loud; stentorian. [Obs.]

         Of this stentorophonic horn of Alexander there is a
         preserved in the Vatican.                --Derham.