Hypertext Webster Gateway: "intrados"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
From WordNet (r) 1.7 (wn)
intrados
n : the interior curve of an arch
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