intrados

in·tra·dos  (ntr-ds, -d, n-trds, -ds) n. pl. in·tra·dos (-dz) or in·tra·dos·es (-dsz) Architecture The inner curve of an arch. [French : intra-, within (from Latin intr-; see intra-) + dos, back (from Old French, from Latin dorsum).]

intrados semicircular arch

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intrados [ɪnˈtreɪdɒs]

n pl -dos, -doses

(Fine Arts & Visual Arts / Architecture) Architect the inner curve or surface of an arch or vault Compare extrados

[from French, from intra- + dos back, from Latin dorsum]

Thesaurus

Noun

1.

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