'Petrous' definitions:

Definition of 'petrous'

(from WordNet)
adjective
(of bone especially the temporal bone) resembling stone in hardness [syn: petrous, stonelike]

Definition of 'Petrous'

From: GCIDE
  • Petrous \Pe"trous\, a. [L. petrosus, fr. petra a stone.]
  • 1. Like stone; hard; stony; rocky; as, the petrous part of the temporal bone. --Hooper. [1913 Webster]
  • 2. (Anat.) Same as Petrosal. [1913 Webster]