Hypertext Webster Gateway: "Extrados"

From Webster's Revised Unabridged Dictionary (1913) (web1913)

Extrados \Ex*tra"dos\, n. [F.; pref. extra- outside + dos (L.
dorsum) the back.] (Arch.)
The exterior curve of an arch; esp., the upper curved face of
the whole body of voussoirs. See {Intrados}.

From WordNet (r) 1.7 (wn)

extrados
n : the exterior curve of an arch

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