The Collaborative International Dictionary of English v.0.48:

Norman \Nor"man\, prop. a. [F. normand, of Scand. origin. See
   Northman, and cf. Norse.]
   Of or pertaining to Normandy or to the Normans; as, the
   Norman language; the Norman conquest.
   [1913 Webster]

   Norman style (Arch.), a style of architecture which arose
      in the tenth century, characterized by great massiveness,
      simplicity, and strength, with the use of the semicircular
      arch, heavy round columns, and a great variety of
      ornaments, among which the zigzag and spiral or
      cable-formed ornaments were prominent.
      [1913 Webster]