extrados


ex·tra·dos

noun \ˈek-strə-ˌdäs, -ˌdō; ek-ˈstrā-ˌdäs\
plural ex·tra·dos·es\-ˌdä-səz\ or ex·tra·dos \-ˌdōz, -ˌdäs\

Definition of EXTRADOS

:  the exterior curve of an arch — see arch illustration

Origin of EXTRADOS

French, from Latin extra + French dos back — more at dossier
First Known Use: 1772

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