intrados
noun
in·tra·dos ˈin-trə-ˌdäs 
-ˌdō;
in-ˈtrā-ˌdäs
plural intrados or intradoses ˈin-trə-ˌdä-səz
ˈin-trə-ˌdōz,
-ˌdäs or intradoses ˈin-trə-ˌdä-səz : the interior curve of an arch see arch illustration
Word History
Etymology
French, from Latin intra within + French dos back — more at dossier
First Known Use
1772, in the meaning defined above
- by stealth
- by step
- by storm
- by the boatload
- by the book
- by the by
- by the bye
- by the count of
- by the day
- by the hand
- by the head
- by the heels
- by the name of
- by the numbers
- by the rules
- by the same token
- by the score
- by the seat of one's pants
- by the skin of one's teeth
- by the sweat of one's brow
- by the time
- by the way
- by the wayside
- by trade
- by turns