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
Recent Examples of petrous from the Web
DNA begins degrading immediately after death, so scientists look for pockets that tend to be preserved in hair, molar teeth, and the petrous bone near the inner ear.
But if there’s any hope of obtaining some, the sample would likely come from the teeth or petrous bone, since their extreme density protects DNA well.
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Origin and Etymology of petrous
Middle English, from Anglo-French *petros, from Latin petrosus, from petra rock, from Greek
First Known Use: 14th centurySee Words from the same year
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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