otocraniumn.
/ˌəʊtə(ʊ)ˈkreɪnɪəm/, U.S. /ˌoʊdoʊˈkreɪniəm/ Anatomy and Zoology. rare.
= otic capsule n. at otic adj. Compounds.
ΚΠ
1890 J. S. Billings National Med. Dict. II. 269/1 Otocranium, the petrous portion of the temporal bone considered as the investment of the organs of hearing.
1953 C. Wakely Faber Med. Dict. 314/2 Otocranium, the cavity of the petrous part of the skull, the seat of the organ of hearing.
1978 Proc. National Acad. Sci. U.S.A. 75 529/2 Pressures exerted at one operculum can produce fluid displacements within the otocranium only by traversing a complex path across the head to the contralateral operculum.
This is a new entry (OED Third Edition, September 2004; most recently modified version published online March 2022).
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n.1890