Source : Webster's Revised Unabridged Dictionary (1913)

Tinnitus \Tin*ni"tus\, n. [L., fr. tinnire to jingle.] (Med.)
   A ringing, whistling, or other imaginary noise perceived in
   the ears; -- called also {tinnitus aurium}.

Source : WordNet®

tinnitus
     n : a ringing or booming sensation in one or both ears; a
         symptom of an ear infection or Meniere's disease