extrados

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ex·tra·dos

 (ĕk′strə-dŏs′, -dōs′)
n. pl. ex·tra·dos (-dōz′) or ex·tra·dos·es (-dŏs′ĭz)
The upper or exterior curve of an arch.

[French : Latin extrā, outside; see extra- + French dos, back (from Latin dorsum).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

extrados

(ɛkˈstreɪdɒs)
n, pl -dos (-dəʊz) or -doses
(Architecture) architect the outer curve or surface of an arch or vault. Compare intrados
[C18: from French, from extra- + dos back, from Latin dorsum]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ex•tra•dos

(ˈɛk strəˌdɒs, -ˌdoʊs, ɛkˈstreɪ dɒs, -doʊs)

n., pl. -dos (-ˌdoʊz, -doʊz)
-dos•es.
the exterior curve or surface of an arch or vault. Compare intrados.
[1765–75; < French, =extra- extra- + dos back (< Latin dorsum)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.extrados - the exterior curve of an archextrados - the exterior curve of an arch  
curve, curved shape - the trace of a point whose direction of motion changes
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