English

intrapetrous

From intra- + petrous.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁énteros ‘inside, within’

Latin *interus

Latin intrā ‘within’

Ancient Greek πέτρα ‘rock formation: cliff, ledge, cave, ridge’

Latin petrōsus ‘full of rocks, rocky’

Middle French petreux

Today it means

adj Within the dense portion of the temporal bone that protects the inner ear.

Language periods are conventional ranges, not dates for this word.

Etymograph / intrapetrous