Source : Webster's Revised Unabridged Dictionary (1913)

Tympanic \Tym*pan"ic\ (?; 277), a. [See {Tympanum}.]
   1. Like a tympanum or drum; acting like a drumhead; as, a
      tympanic membrane.

   2. (Anat.) Of or pertaining to the tympanum.

   {Tympanic bone} (Anat.), a bone of the skull which incloses a
      part of the tympanum and supports the tympanic membrane.
      

   {Tympanic membrane}. (Anat.) See the Note under {Ear}.

Source : WordNet®

tympanic bone
     n : the bone enclosing the middle ear