extrados

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

Definition of extrados 

: the exterior curve of an arch — see arch illustration

First Known Use of extrados

1772, in the meaning defined above

History and Etymology for extrados

French, from Latin extra + French dos back — more at dossier

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The first known use of extrados was in 1772

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