pendentive

[pen-den-tiv]

pen·den·tive

[pen-den-tiv]
noun Architecture.
1.
any 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.
2.
any 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.
adjective
3.
functioning as, or substituting for, a pendentive: pendentive corbeling.

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Pendentive is always a great word to know.
So is landing. Does it mean:
a platform between flights of stairs or the floor at the head or foot of a flight of stairs
an enclosure beside a church such as an atrium or cloister

Origin:
1720–30; pendent + -ive, modeled on French pendentif
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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World English Dictionary
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
 
[C18: from French pendentif, from Latin pendens hanging, from pendere to hang]

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