\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.