Webster's Revised Unabridged Dictionary · 1913

Extrastapedial

Extrastapedial (eks`trȧ*staȧ*pē"di*al) , adjective

(Anatomy) Pertaining to a part of the columella of the ear, which, in many animals, projects beyond the connection with the stapes.
(Anatomy) The extrastapedial part of columella.