petrosal adjective & noun. [pɪ'trǝʊs(ǝ)l] M18.
[from Latin petrosus stony, rocky, from petra stone: see -OSE¹, -AL¹.]
Anatomy.
A. adjective. Designating, belonging to, or connected with the petrous portion of the temporal bone; designating nerves derived from the facial and glosso-pharyngeal nerves that pass through the petrosal bone or are situated in a notch in it. M18.
b. noun. The petrosal bone. M19.

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