intrados

in·tra·dos Audio Help (ĭn'trə-dŏs', -dō', ĭn-trā'dŏs', -dōs')

n. pl. in·tra·dos (-dōz') or in·tra·dos·es (-dŏs'ĭz) Architecture
The inner curve of an arch.

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

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