Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A three-sided, curved section of vaulting between the rim of a dome and each adjacent pair of the arches that support it.

from The Century Dictionary.

  • Having pendentives; of the shape of or pertaining to pendentives.
  • noun In architecture, one of the triangular segments of the lower part of a hemispherical dome left by the penetration of the dome by two semicircular or ogival vaults, intersecting at right angles.

from the GNU version of the Collaborative International Dictionary of English.

  • noun 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.
  • noun The part of a groined vault which is supported by, and springs from, one pier or corbel.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun architecture The concave triangular sections of vaulting that provide the transition between a dome and the square base on which it is set and transfer the weight of the dome.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French pendentif, from Latin pendēns, pendent-, hanging, present participle of pendēre, to hang; see (s)pen- in Indo-European roots.]

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