Ogee arch

from WordNet (r) 3.0 (2006)

ogee arch
    n 1: a pointed arch having an S-shape on both sides [syn: {ogee
         arch}, {keel arch}]

from The Collaborative International Dictionary of English v.0.48

Ogee \O*gee"\, n. [F. ogive, augive, LL. augiva, of uncertain
   origin; cf.LL. ogis a support, prop. L. augere to increase,
   strengthen, Sp. auge highest point of power or fortune,
   apogee, Ar. auj, an astronomical term.]
   [1913 Webster]
   1. (Arch.) A molding, the section of which is the form of the
      letter S, with the convex part above; cyma reversa. See
      Illust. under {Cyma}.
      [1913 Webster]

   2. Hence, any similar figure used for any purpose.
      [1913 Webster]

   {Ogee arch} (Arch.), a pointed arch, each of the sides of
      which has the curve of an ogee, that is, has a reversed
      curve near the apex.
      [1913 Webster]