The Collaborative International Dictionary
Extrastapedial
Extrastapedial \Ex`tra*sta*pe"di*al\ ([e^]ks`tr[.a]*sta[.a]*p[=e]"d[i^]*al), a. (Anat.) Pertaining to a part of the columella of the ear, which, in many animals, projects beyond the connection with the stapes. -- n. The extrastapedial part of columella.
Wiktionary
extrastapedial
a. (context anatomy English) Projecting beyond the stapes; applied to part of the columella of the ear.