Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The inner curve of an arch.

from The Century Dictionary.

  • noun In architecture, the interior or lower line, curve, or surface of an arch or vault. The exterior or upper curve or surface is called the extrados. See arch, 2.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Arch.) The interior curve of an arch; esp., the inner or lower curved face of the whole body of voussoirs taken together. See extrados.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun architecture The inner curve of an arch or vault.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the interior curve of an arch

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French : intra-, within (from Latin intrā-; see intra–) + dos, back (from Old French, from Latin dorsum).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French, from Latin intra ("within") + French dos ("back") (from Latin dostrum).

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