platybasian.
/ˌplatɪˈbeɪsɪə/, U.S. /ˌplædiˈbeɪsiə/ Medicine.
Flattening of the base of the skull; esp. a developmental or acquired abnormality in which there is invagination of the area of the skull around the foramen magnum (basilar impression).
ΚΠ
1895 Jrnl. Anthropol. Inst. 24 462 Enlargement of the anterior portion of the brain mass gives rise to important gravitation changes affecting the base of the skull. With brachycephaly there is frequently associated some degree of platybasia.
1934 Acta Radiologica 15 652 Basilar impression—or platybasia as it is less adequately termed—is a fairly rare phenomenon.
1955 Brain 78 237 Flattening of the basal angle (platybasia) was formerly confused with basilar impression.
1984 J. R. Tighe & D. R. Davies Pathol. (ed. 4) xxv. 237 This malformation is often accompanied by other congenital defects such as..platybasia.
This is a new entry (OED Third Edition, June 2006; most recently modified version published online March 2022).
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