tinnitus

from WordNet (r) 3.0 (2006)

tinnitus
    n 1: a ringing or booming sensation in one or both ears; a
         symptom of an ear infection or Meniere's disease

from The Collaborative International Dictionary of English v.0.48

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}.
   [1913 Webster]