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tierceron

[teer-ser-uh n]
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noun
  1. (in a ribbed vault) a diagonal rib, other than an ogive, springing from a point of support.
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Origin of tierceron

1835–45; < French, equivalent to tierce tierce + -eron noun suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018