Intrados
Pronunciation : In*tra"dos
Part of Speech : n.
Etymology : [F., fr. L. intra within + F. dos the back, L. dorsum. Cf. Extrados.] (Arch.)
Definition : Defn: The interior curve of an arch; esp., the inner or lower curved face of the whole body of voussoirs taken together. See Extrados.
Source : Webster's Unabridged Dictionary, 1913