intrados

noun
in·​tra·​dos | \ˈin-trə-ˌdäs, -ˌdō;in-ˈtrā-ˌdäs\
plural intrados\ˈin-​trə-​ˌdōz, -​ˌdäs \ or intradoses\ˈin-​trə-​ˌdä-​səz \

Definition of intrados 

: the interior curve of an arch — see arch illustration

First Known Use of intrados

1772, in the meaning defined above

History and Etymology for intrados

French, from Latin intra within + French dos back — more at dossier

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The first known use of intrados was in 1772

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