extrados

[ek-struh-dos, -dohs, ek-strey-dos, -dohs]

noun

Architecture.

plural

extrados, extradoses 

1. the exterior curve or surface of an arch or vault.

extrados

/ ɛkˈstreɪdɒs /

noun

1. architect the outer curve or surface of an arch or vault Compare intrados

Word History and Origins

Origin of extrados¹

1765–75; < French, equivalent to extra- extra- + dos back (< Latin dorsum dorsum

Word History and Origins

Origin of extrados¹

C18: from French, from _extra- + dos back, from Latin dorsum