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[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
the exterior curve or surface of an arch or vault.
Also called back.
Compare intrados.
Origin of extrados
1765-75; < French, equivalent to extra- extra- + dos back (< Latin dorsum dorsum Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for extrados


noun (pl) -dos (-dəʊz), -doses
(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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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