Bible Dictionaries
Pendentive

Webster's Dictionary

(1):

(n.) 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.

(2):

(n.) The part of a groined vault which is supported by, and springs from, one pier or corbel.

Bibliography Information
Webster, Noah. Entry for 'Pendentive'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/pendentive.html. 1828.