Pe*tro"sal (?), a. [See Petrous.] (Anat.) (a) Hard; stony; petrous; as, the petrosal bone; petrosal part of the temporal bone. (b) Of, pertaining to, or in the region of, the petrous, or petrosal, bone, or the corresponding part of the temporal bone.

Petrosal bone(Anat.), a bone corresponding to the petrous portion of the temporal bone of man; or one forming more or less of the periotic capsule.

Pe*tro"sal, n. (Anat.) (a) A petrosal bone. (b) The auditory capsule. Owen.