Anatomy. The conical central axis of the cochlea of the ear.

In Anatomy, Zoology, etc. A dome-like organ or process; esp. the arched dome-shaped summit of the cochlea of the ear.

Of, pertaining to, or situated at the base, esp. at that of the skull. basilar membrane, spec. the membrane in the cochlea that bears the organ of…

the vestibular membrane, which separates the cochlear duct and the vestibular canal in the labyrinth of the inner ear.