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extrados

[ek-struh-dos, -dohs, ek-strey-dos, -dohs] /ˈɛk strəˌdɒs, -ˌdoʊs, ɛkˈstreɪ dɒs, -doʊs/
noun, plural extrados
[ek-struh-dohz, ek-strey-dohz] /ˈɛk strəˌdoʊz, ɛkˈstreɪ doʊz/ (Show IPA),
extradoses. Architecture
1.
the exterior curve or surface of an arch or vault.
Also called back.
Compare intrados.
Origin
1765-1775
1765-75; < French, equivalent to extra- extra- + dos back (< Latin dorsum dorsum
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for extra doses

extrados

/ɛkˈstreɪdɒs/
noun (pl) -dos (-dəʊz), -doses
1.
(architect) the outer curve or surface of an arch or vault Compare intrados
Word Origin
C18: from French, from extra- + dos back, from Latin dorsum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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