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petromastoid
petromastoid adj. and n.
Brit. 
/ˌpɛtrə(ʊ)ˈmastɔɪd/
, /ˌpɛtrə(ʊ)ˈmastɔɪd/U.S. /ˌpɛtroʊˈmæˌstɔɪd/
/ˌpɛtroʊˈmæˌstɔɪd/ΚΠ
1845 R. Owen in Q. Jrnl. Geol. Soc. 1 258 The petro-mastoid..presents a rough convexity.
1848 R. Owen On Archetype & Homologies Vertebr. Skeleton 29 The coalescence of the primitively distinct mastoid with the ossifying capsule of the labyrinth is very speedy,..and a composite ‘petromastoid’ bone is thus formed.
1875 Encycl. Brit. I. 824/2 Each [temporal] bone consists originally of four subdivisions—a squamoso-zygomatic, a tympanic, a petro-mastoid, and a styloid.
1953 Radiography 19 144 (title) Radiography of the petromastoid portion of the temporal bones.
1988 Amer. Jrnl. Physical Anthropol. 77 160 The lack of a definite petromastoid canal in G. gorilla may relate to the highly expanded petromastoid in this species.
2002 European Radiol. 12 2770 The objective was to assess visibility and anatomy of the petromastoid canal in high-resolution CT.
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