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petrotympanic
petrotympanic adj. and n.
Brit. 
/ˌpɛtrə(ʊ)tɪmˈpanɪk/
, /ˌpɛtrə(ʊ)tɪmˈpanɪk/U.S. /ˌpɛtroʊtɪmˈpænɪk/
/ˌpɛtroʊtɪmˈpænɪk/ΚΠ
1842 R. Owen in Trans. Geol. Soc. 6 77 The petro-tympanic bone of the Cetacea.
1854 R. Owen Struct. Skeleton & Teeth in Orr's Circle Sci.: Org. Nature I. 238 [In the giraffe] the petrotympanic is a separate bone, as in all ruminants.
1952 Amer. Jrnl. Surg. 83 648/2 These walls meet above the petrotympanic fissure.
2004 Surg. & Radiol. Anat. 26 39 The ALM [= anterior ligament of malleus] had a structure apparently composed of the superior and inferior lamellae, running anteriorly in continuation with the sphenomandibular ligament through the future petrotympanic fissure.
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