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Definition of petrous : 1. Like stone; hard; stony; rocky; as, the petrous part of the temporal bone.
2. Same as Petrosal.

Synonyms:

hard, stonelike

Usage examples:

• With bone forceps or a fine saw, split open the petrous portion of the temporal bone and observe the cochlea and the semicircular canals. - "Physiology and Hygiene for Secondary Schools", Francis M. Walters, A.M..
• 121 The inner projection of the temporal bone is known as the petrous process. - "Physiology and Hygiene for Secondary Schools", Francis M. Walters, A.M..