interstapedial

from The Collaborative International Dictionary of English v.0.48

Interstapedial \In`ter*sta*pe"di*al\, a. (Anat.)
   Pertaining to a part of the columella of the ear, between the
   stapes and the mediostapedial. -- n. The interstapedial part
   of the columella.
   [1913 Webster]