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The Collaborative International Dictionary

Petrean

Petrean \Pe*tre"an\ (p[-e]*tr[=e]"an), a. [L. petraeus, Gr. petrai^os, fr. pe`tra a rock.] Of or pertaining to rock.
--G. S. Faber.

Wiktionary

petrean

a. Composed of rock or stone; rocky, stony. alt. Composed of rock or stone; rocky, stony.