pet·rous (p t r s)adj. 1. Of, relating to, or resembling rock, especially in hardness; stony. 2. Of or relating to the very dense, hard portion of the temporal bone that forms a protective case for the inner ear. [Middle English, from Old French petros, from Latin petr  sus, rocky, from petra, rock, from Greek petr ; see per-2 in Indo-European roots.] |
petrous [ˈpɛtrəs ˈpiː-]
adj
1. (Life Sciences & Allied Applications / Anatomy) Anatomy denoting the dense part of the temporal bone that surrounds the inner ear
2. Rare like rock or stone
[from Latin petrōsus full of rocks]
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