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A secondary or intermediate rib in a rib vault that rises from one of the main springers and connects to a point on the ridge rib.

[French, from tierce, tierce; see tierce.]
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) architect (in Gothic architecture) a type of supporting rib on a vault
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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For example, he addresses the complex racial makeup of various Creoles and their astonishingly precise social labels: "mulatto (black and white), griffe (black and mulatto), sacrato (black and griffe), marabon (mulatto and griffe), os rouge (black and Indian), quadroom (white and mulatto), tierceron (mulatto and quadroon), and octoroon (white and quadroon)" (p.
We also said farewell to Dave Thom (Prince Hansel), Don Enrico Incisa (Tierceron), Peter Bevan (Jer), Pat Rooney (Arctic Stream), Pat Mitchell and Helen Bridges, the Shaftesbury permit-holder who was killed in a fall on her gallops in April.
For several years he trained in Milan and his most notable winners were his father's horses Tierceron, who won the Gran Premio d'Italia and Gran P remio del Jockey Club in 1972, Tratteggio and Mannsfeld.