rib vault
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Related to rib vault: groin vault
rib vault
n.
A vault in which the surface is divided into webs by a framework of diagonal arched ribs. Also called ribbed vault.
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.