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Petrous

Adjective

pet=rous

WORDNET DICTIONARY

petrous(s = adj.all) stonelike - (of bone especially the temporal bone) resembling stone in hardness; Array

Petrous, a. [L. petrosus, fr. petra a stone.].

Like stone; hard; stony; rocky; as, the petrous part of the temporal bone. Hooper. [1913 Webster]
Same as Petrosal. [1913 Webster]

Petrous, adj.
1 Anat. denoting the hard part of the temporal bone protecting the inner ear.
2 Geol. of, like, or relating to rock.

Etymology

L petrosus f. L petra rock f. Gk

For further exploring for "Petrous" in Webster Dictionary Online