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The Collaborative International Dictionary
Extrados

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.

Wiktionary
extrados

n. (context architecture English) The outer or upper curve of an arch.

WordNet
extrados

n. the exterior curve of an arch