intrados

Etymology

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

intrados means the inner curve of an arch or vault. Lexicurio rates it Sui generis — a strength score of 87 out of 100.

noun

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.”