extrados

ex·tra·dos

E0300500 (ĕk′strə-dŏs′, -dōs′)n. pl. ex·tra·dos (-dōz′) or ex·tra·dos·es (-dŏs′ĭz) The upper or exterior curve of an arch.

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[French : Latin extrā, outside; see extra- + French dos, back (from Latin dorsum).]

extrados

(ɛkˈstreɪdɒs) n, pl -dos (-dəʊz) or -doses (Architecture) architect the outer curve or surface of an arch or vault. Compare intrados[C18: from French, from extra- + dos back, from Latin dorsum]

ex•tra•dos

(ˈɛk strəˌdɒs, -ˌdoʊs, ɛkˈstreɪ dɒs, -doʊs)

n., pl. -dos (-ˌdoʊz, -doʊz)
-dos•es. the exterior curve or surface of an arch or vault. Compare intrados. [1765–75; < French, =extra- extra- + dos back (< Latin dorsum)]

Thesaurus

Noun

1.

extrados - the exterior curve of an arch curve, curved shape - the trace of a point whose direction of motion changes