pen·den·tive /pɛnˈdɛntɪv/
穹隅
Pen·den·tive n. Arch. (a) The portion of a vault by means of which the square space in the middle of a building is brought to an octagon or circle to receive a cupola. (b) The part of a groined vault which is supported by, and springs from, one pier or corbel.
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