n.
Pronunciation: ' in-tr ə - ˌ däs, - ˌ d ō ; in- ' tr ā - ˌ däs
Function: noun
Inflected Form: plural -dos \ - ˌ d ō z, - ˌ däs \ or -dos · es \ - ˌ dä-s ə z \
Etymology: French, from Latin intra within + French dos back ― more at DOSSIER
Date: 1772
: the interior curve of an arch ― see ARCH illustration