a rib that runs along the ridge of a vault.
a stone or piece of timber placed at the apex of the gable in a vault or a timber roof.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use ridge rib in a sentence
The beautiful foliaged bosses along the ridge rib are best seen from the triforium or the clerestory.Bell's Cathedrals: The Cathedral Church of Lincoln | A. F. Kendrick