extrados

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

ex·tra·dos

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


Origin:
1765–75; < French, equivalent to extra- extra- + dos back (< Latin dorsum dorsum
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Extrados is always a great word to know.
So is stele. Does it mean:
a prepared surface on the face of a building or a rock bearing an inscription
a low wall forming a base for a construction, as a colonnade or dome; the masonry supporting a classical temple
Collins
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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