Extrados

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Extrados \Ex*tra"dos\, n. [F.; pref. extra- outside + dos (L.
     dorsum) the back.] (Arch.)
     The exterior curve of an arch; esp., the upper curved face of
     the whole body of voussoirs. See {Intrados}.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  extrados
       n : the exterior curve of an arch