In‐tra″dos (?), n. [F., fr. L. intra within + F. dos the back, L. dorsum. Cf. Extrados.] (Arch.) The interior curve of an arch; esp., the inner or lower curved face of the whole body of voussoirs taken together. See Extrados.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.