intrados

[in-truh-dos, -dohs, in-trey-dos, -dohs]

noun, plural in·tra·dos [in-truh-dohz, in-trey-dohz] /ˈɪn trəˌdoʊz, ɪnˈtreɪ doʊz/, in·tra·dos·es. Architecture.

the interior curve or surface of an arch or vault.

Compare extrados.

Origin of intrados

1765–75; < French, equivalent to intra- intra- + dos back; see dosser¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for intrados

Historical Examples of intrados

Intrados: The under or concave face of the solid structure of an arch.
How to judge architecture
Russell Sturgis
The under or concave side of the voussoirs is called the intrados, and the upper or convex side the extrados of the arch.
The New Gresham Encyclopedia. Vol. 1 Part 2
Various
The lower surface or soffit of the arch is the intrados, E, and the upper surface the extrados, F.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4
Various
It was determined to attempt to stop these leaks by the application of a water-proof cement coating on the intrados of the arch.
Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910
James H. Brace and Francis Mason
The four sides of the mold formed the extrados, the intrados, and the two ends of the block; the other two sides being left open.
Concrete Construction
Halbert P. Gillette

British Dictionary definitions for intrados

intrados

noun plural -dos or -doses

architect the inner curve or surface of an arch or vaultCompare extrados

Word Origin for intrados

C18: from French, from intra- + 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