Dictionary

petrous

adjective pe·trous \ˈpe-trəs, ˈpē-\

Definition of PETROUS

:  of, relating to, or constituting the exceptionally hard and dense portion of the human temporal bone that contains the internal auditory organs

Origin of PETROUS

Middle English, from Anglo-French *petros, from Latin petrosus, from petra rock, from Greek
First Known Use: 14th century

petrous

adjective pe·trous \ˈpe-trəs, ˈpē-\   (Medical Dictionary)

Medical Definition of PETROUS

:  of, relating to, or constituting the exceptionally hard and dense portion of the human temporal bone that contains the internal auditory organs and is a pyramidal process wedged in at the base of the skull between the sphenoid and occipital bones with its lower half exposed on the surface of the skull and pierced by the external auditory canal

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