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A three-sided, curved 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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Architecture) 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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
one of several spandrels, in the form of concave triangles, forming a transition between the circular plan of a dome and the polygonal plan of the supporting masonry.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.