intrados

noun

1. The inner curve of an arch or vault.

   * Application of stitching bars to intrados (inner arch) though cracked voussoirs, grout and apply crack injection to seal.

Where it comes from

From French, from Latin intra (“within”) + French dos (“back”) (from Latin dostrum).

Adapted from the Wiktionary entry intrados (CC BY-SA 4.0).

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