pendentive
pen·den·tive
 Audio Help (pěn-děn'tĭv) 
n.
Architecture
A triangular section of vaulting between the rim of a dome and each adjacent pair of the arches that support it.
[French pendentif, from Latin pendēns, pendent-, hanging, present participle of pendēre, to hang; see (s)pen- in Indo-European roots.]
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The American Heritage® Dictionary of the English Language, Fourth Edition
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