Pendentive

Definition:

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

Compare pendentive with other words:

pendent vs. pendentive

pendentive vs. triangular

dome vs. pendentive

concave vs. pendentive