• synonyms


[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.
  1. the interior curve or surface of an arch or vault.
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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. 2018

Examples from the Web for intrados

Historical Examples

  • 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 lower surface or soffit of the arch is the intrados, E, and the upper surface the extrados, F.

  • It was determined to attempt to stop these leaks by the application of a water-proof cement coating on the intrados of the arch.

  • 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


noun plural -dos or -doses
  1. architect the inner curve or surface of an arch or vaultCompare extrados
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Word Origin

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