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Meaning of pendentive

pen•den•tive

Pronunciation: (pen-den'tiv), [key]
— n. Archit.
  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.
—adj.
  1. functioning as, or substituting for, a pendentive: pendentive corbeling.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.