Pe‐tre″an (pē̍‐trē″an), a. [L. petraeus, Gr. πετραι̑οσ, fr. πέτρα a rock.] Of or pertaining to rock. G. S. Faber.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.