petrous

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pet·rous

 (pĕt′rəs)
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 petrōsus, rocky, from petra, rock, from Greek petrā; see per- in Indo-European roots.]

petrous

(ˈpɛtrəs; ˈpiː-)
adj
1. (Anatomy) anatomy denoting the dense part of the temporal bone that surrounds the inner ear
2. rare like rock or stone
[C16: from Latin petrōsus full of rocks]

pet•rous

(ˈpɛ trəs, ˈpi-)

adj.
like stone, esp. in hardness; stony; rocky.
[1350–1400; Middle English (< Middle French petros) < Latin petrōsus rocky.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.petrous - (of bone especially the temporal bone) resembling stone in hardness
hard - resisting weight or pressure