'Intrados' definitions:

Definition of 'intrados'

(from WordNet)
noun
The interior curve of an arch

Definition of 'Intrados'

From: GCIDE
  • Intrados \In*tra"dos\, n. [F., fr. L. intra within + F. dos the back, L. dorsum. Cf. Extrados.] (Arch.) The interior curve of an arch; esp., the inner or lower curved face of the whole body of voussoirs taken together. See Extrados. [1913 Webster]