intrados

noun
in·​tra·​dos | \ ˈin-trə-ˌdäs How to pronounce intrados (audio) , -ˌdō; in-ˈtrā-ˌdäs\
plural intrados\ ˈin-​trə-​ˌdōz How to pronounce intrados (audio) , -​ˌdäs \ or intradoses\ ˈin-​trə-​ˌdä-​səz How to pronounce intradoses (audio) \

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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