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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 ex·tra·dos /ˈɛkstrəˌdɑs, ˌdo; ɛkˈstreˌdɑs/
 拱背;拱洞的外弧面

From: Webster's Revised Unabridged Dictionary (1913)

 Ex·tra·dos n.  Arch. The exterior curve of an arch; esp., the upper curved face of the whole body of voussoirs. See Intrados.
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From: WordNet (r) 2.0

 extrados
      n : the exterior curve of an arch