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  • WordNet 3.6
    • n extrados the exterior curve of an arch
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Webster's Revised Unabridged Dictionary
    • n Extrados (Arch) The exterior curve of an arch; esp., the upper curved face of the whole body of voussoirs. See Intrados.
    • ***
Century Dictionary and Cyclopedia
    • n extrados The upper or convex surface of an arch or of a vault. The extrados of an arch is the curved surface formed by the upper or outer faces of the voussoirs in position, when this surface and the intrados are concentric and parallel. See first cut under arch.
    • n extrados The outer curve of a voussoir. See arch, 2.
    • n extrados In mech., the locus of the lower ends of wires, of uniform weight per unit of length, hanging down from points on a cord which is perfectly flexible, inextensible, and without weight. When the wires are equally distant from one another and of equal length, the extrados is a parabola.
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Chambers's Twentieth Century Dictionary
    • n Extrados eks-trā′dos the convex surface of an arch or vault.
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Webster's Revised Unabridged Dictionary
F.; pref. extra-, outside + dos,L. dorsum,) the back
Chambers's Twentieth Century Dictionary


In literature:

Define the intrados and extrados of an arch.
"Scientific American Supplement, No. 561, October 2, 1886" by Various
The stability of such structures depends on the position of the line of pressure relatively to the intrados and extrados of the arch ring.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3" by Various
Tomlinson, can you tell me what the extrados of a voussoir is?
"The Strange Case of Mortimer Fenley" by Louis Tracy
The pavement of the terrace, which consists of a double bed of large bricks, rests upon the extrados of the upper channel.
"A History of Art in Chaldæa & Assyria, v. 1" by Georges Perrot
The Tuscan arch, where the extrados takes the form of a pointed arch.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4" by Various

In news:

The amount of reduction from original wall thickness of pipe or tube to the amount of wall thickness remaining in the extrados of a bend after forming.

In science:

En lugar de utilizar métodos empíricos para realizar las evaluaciones, debe derivarse de nociones computacionales bien fundadas con forma1Parte del material de este capítulo ha sido extraído a partir del artículo .
Analysis of first prototype universal intelligence tests: evaluating and comparing AI algorithms and humans
Parte del material de esta sección ha sido extraído a partir de este artículo.
Analysis of first prototype universal intelligence tests: evaluating and comparing AI algorithms and humans