Meaning of extrados

ex•tra•dos

Pronunciation: (ek'stru-dos", -dōs", ek-strā'dos, -dōs), [key]
— pl. -dos -dos•es.
  1. the exterior curve or surface of an arch or vault. Also calledCf. intrados. See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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