The Collaborative International Dictionary of English v.0.48:

Tudor \Tu"dor\, a.
   Of or pertaining to a royal line of England, descended from
   Owen Tudor of Wales, who married the widowed queen of Henry
   V. The first reigning Tudor was Henry VII.; the last,
   Elizabeth.
   [1913 Webster]

   Tudor style (Arch.), the latest development of Gothic
      architecture in England, under the Tudors, characterized
      by flat four-centered arches, shallow moldings, and a
      profusion of paneling on the walls.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Tudor
    adj 1: of or relating to a style of architecture in England in
           the 15th century; "half-timbered Tudor houses"; "Tudor
           furniture"
    n 1: an English dynasty descended from Henry Tudor; Tudor
         monarchs ruled from Henry VII to Elizabeth I (from 1485 to
         1603) [syn: Tudor, House of Tudor]
    2: United States dancer and choreographer (born in England)
       (1909-1987) [syn: Tudor, Antony Tudor]
    3: a member of the dynasty that ruled England