Pen‐den″tive (pĕn‐dĕnt″ĭv), n. [F. pendentif, fr. L. pendere to hang.] (Arch.) (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 which is supported by, and springs from, one pier or corbel.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.