pendentive
/penˈdentɪv/noun
- Architecture a curved triangle of vaulting formed by the intersection of a dome with its supporting arches【建筑】（由穹和其支撑拱构成的）斗拱, 三角拱。
词源
early 18th cent.: from the French adjective pendentif, -ive, from Latin pendent- 'hanging down', from the verb pendere.