Definitions from Wiktionary (petrosal)

▸ adjective:  Of great hardness; petrous.
▸ adjective:  (anatomy, relational) Of, pertaining to, or located near the petrous part of the temporal bone or the capsule of the inner ear.
▸ noun:  (anatomy) The petrous part of the temporal bone at the base of the skull, surrounding the inner ear.
▸ noun:  (anatomy, zootomy) The auditory capsule.




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