Source : Webster's Revised Unabridged Dictionary (1913)

Stentorian \Sten*to"ri*an\, a. [L. stentoreus; cf. Gr. ?.]
   Of or pertaining to a stentor; extremely loud; powerful; as,
   a stentorian voice; stentorian lungs.

Source : WordNet®

stentorian
     adj : used of the voice [syn: {booming}]