osseous labyrinth

n.
  1. A series of cavities in the petrous portion of the temporal bone, consisting of the cochlea, the vestibule, and the semicircular canals, and lodging the membranous labyrinth.bony labyrinth
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.