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extrados

[ek-struh-dos, -dohs, ek-strey-dos, -dohs]
noun, plural ex·tra·dos [ek-struh-dohz, ek-strey-dohz] /ˈɛk strəˌdoʊz, ɛkˈstreɪ doʊz/, ex·tra·dos·es. Architecture.
  1. the exterior curve or surface of an arch or vault.
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Origin of extrados

1765–75; < French, equivalent to extra- extra- + dos back (< Latin dorsum dorsum
Also called back.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for extrados

extrados

noun plural -dos (-dəʊz) or -doses
  1. architect the outer curve or surface of an arch or vaultCompare intrados
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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