petrosal UK /pɪˈtɹəʊ.səl/US /pəˈtɹoʊ.səl/adjective 2noun 2forms 1 adjective2 •Of, pertaining to, or located near the petrous part of the temporal bone or the capsule of the inner ear. •Of great hardness; petrous. noun2 •The petrous part of the temporal bone at the base of the skull, surrounding the inner ear. •The auditory capsule.midal-shaped petrosal of mammals and bird — 1866 formspetrosals
