The story
- Latin · derived fromextra“outside”
- French · derived fromextradossé“outer curve”
- English todayextrados
From French extradossé (“outer curve”) from Latin extra (“outside”) + dos (“back”) (from Latin dorsum).
Words from the same roots
Latinextra all →
extravagantastrayextra-extravagateextroitivestravaig
Etymology from Wiktionary, CC BY-SA 4.0.