
1) French word used in English 2) Type of arch
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https://www.crosswordclues.com/clue/pendentive

three-dimensional spandrels supporting the weight of a dome over a square or rectangular base.
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http://en.wikipedia.org/wiki/Glossary_of_architecture

Prior to the pendentive`s development, the device of corbelling or the use of the squinch in the corners of a room had been employed. Pendentives were commonly used in Orthodox, Renaissance, and Baroque churches, with a drum with windows often inserted between the pendentives and the dome. The first experimentation with pendentives were made in R....
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http://en.wikipedia.org/wiki/Pendentive

• (n.) The part of a groined vault which is supported by, and springs from, one pier or corbel. • (n.) 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.
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http://thinkexist.com/dictionary/meaning/pendentive/

in architecture, a triangular segment of a spherical surface, filling in the upper corners of a room, in order to form, at the top, a circular ... [3 related articles]
Found on
http://www.britannica.com/eb/a-z/p/38

a sort of curved triangle, which is the solution to the problem of placing a dome on top of a square. The pendentive is in effect, a section of a dome, in the shape of a triangle which rises from a corner of the square, to meet in a circle from which the base of the dome can be constructed. ...
Found on
http://www.encyclo.co.uk/local/20935
Pen·den'tive noun [ French
pendentif , from Latin
pendere to hang.]
(Architecture) (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 whic...
Found on
http://www.encyclo.co.uk/webster/P/45

A spherical triangle which acts as a transition between a circular dome and a square base on which the dome is set
Found on
http://www.pitt.edu/~medart/menuglossary/INDEX.HTM

In architecture a pendentive is the portion of a groined ceiling supported by one pillar or impost, and bounded by the apex of the longitudinal and transverse vaults. In Gothic ceilings of this kind the ribs of the vaults descend from the apex to the impost of each pendentive, where they become united. Also the portion of a domical vault which desc...
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http://www.probertencyclopaedia.com/browse/TP.HTM

A concave, triangular piece of masonry placed at the corners of a square bay and used to make a structural and visual transition from the square bay to the circular base of a covering drum or dome. It is actually, a triangular section of a hemisphere. Contrast with: squinch.
Found on
http://www.virtualani.org/glossary/index.htm
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