intrados

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

intrados (plural intradoses or intrados)

1. (architecture) The inner curve of an arch or vault.
   • 2020 May 20, Philip Haigh, “Ribblehead: at the heart of the S&C's survival and its revival: Ribblehead Viaduct repairs”, in Rail, page 27:

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

• extrados

• “intrados”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.

• Andriots, diatrons, tindoras, transoid

From French intrados.

intrados n (plural intradosuri)

1. intrados