extrados

/ek-struh-dos, -dohs, ek-strey-dos, -dohs/US // ˈɛk strəˌdɒs, -ˌdoʊs, ɛkˈstreɪ dɒs, -doʊs //UK // (ɛkˈstreɪdɒs) //

外来者,外来人员,外来的,外来人口

Definitions

n.名词 noun

1
plural ex·tra·dos [ek-struh-dohz, ek-strey-dohz], /ˈɛk strəˌdoʊz, ɛkˈstreɪ doʊz/, ex·tra·dos·es.Architecture.
- : the exterior curve or surface of an arch or vault.

The under or concave side of the voussoirs is called the intrados, and the upper or convex side the extrados of the arch.
This arch was roughhewn on the flat surfaces and on about half of the outer curved surface, or extrados.
The inner surface, or intrados, and the remainder of the extrados are smoothly dressed (fig. 38).
The pavement of the terrace, which consists of a double bed of large bricks, rests upon the extrados of the upper channel.
The form of the mound may be described as reproducing the extrados of a depressed arch.