pendentive

pen•den•tive n. [Archit.]

Architectureany of several spandrels, in the form of spherical triangles, forming a transition between the circular plan of a dome and the polygonal plan of the supporting masonry.
Building, Architectureany of several masonry devices, as squinches or trompes, for forming a transition between a circular or polygonal construction, as a dome or lantern, and supporting masonry of a different plan.

adj.

Building, Architecturefunctioning as, or substituting for, a pendentive:pendentive corbeling.

Collins Concise English Dictionary © HarperCollins Publishers::

pendentive /pɛnˈdɛntɪv/ n

any of four triangular sections of vaulting with concave sides, positioned at a corner of a rectangular space to support a circular or polygonal dome

Etymology: 18th Century: from French pendentif, from Latin pendens hanging, from pendere to hang

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