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tier·ce·ron

(tîrsə-rŏn′)

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.]

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tierceron

Salisbury Cathedral

Salisbury, England

Indo-European & Semitic Roots Appendices

Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

Indo-European Roots

Semitic Roots

The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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