[ek-struh-dos, -dohs, ek-strey-dos, -dohs]
noun, plural extrados [ek-struh-dohz, ek-strey-dohz] , extradoses. Architecture.
the exterior curve or surface of an arch or vault.
Also called back.
Compare intrados.

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

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World English Dictionary
extrados (ɛkˈstreɪdɒs)
n , pl -dos, -doses
architect Compare intrados the outer curve or surface of an arch or vault
[C18: from French, from extra- + dos back, from Latin dorsum]

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Example sentences
The arch has a central molded keystone, carved extrados and paneled intrados.
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