1. resembling rock in hardness; very hard or stony
Usage: formal
2. relating to the dense part of the temporal bone of the skull
Usage: anatomy; medical

Examples

• The petrous cliffs stood unmoved by centuries of wind and rain.
• His petrous expression revealed no emotion during the interrogation.
• The petrous part of the temporal bone houses the inner ear structures.
• Geologists studied the petrous formations in the ancient mountain range.
• The surgeon carefully avoided the petrous portion during the procedure.
• Her petrous determination helped her overcome every obstacle.