Source : Webster's Revised Unabridged Dictionary (1913)

Palladian \Pal*la"di*an\, a. (Arch.)
   Of, pertaining to, or designating, a variety of the revived
   classic style of architecture, founded on the works of Andrea
   Palladio, an Italian architect of the 16th century.

Source : WordNet®

Palladian
     adj : referring to or relating to or having the style of
           architecture created by Andrea Palladio; "the much
           imitated arch and column compositions known as the
           Palladian motif"