Pronunciation: (tēr'sur-un), Strict Standards: Non-static method FenSites::linkTo() should not be called statically in /site/html/dictionary/tierceron.html on line 75 [key]
(in a ribbed vault) a diagonal rib, other than an ogive, springing from a point of support. See illus. under vault 1.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.