Source : Webster's Revised Unabridged Dictionary (1913)

Peristyle \Per"i*style\, n. [L. peristylum, Gr. ?, ?; ? about +
   ? a column: cf. F. p['e]ristyle.] (Arch.)
   A range of columns with their entablature, etc.;
   specifically, a complete system of columns, whether on all
   sides of a court, or surrounding a building, such as the
   cella of a temple. Used in the former sense, it gives name to
   the larger and inner court of a Roman dwelling, the
   peristyle. See {Colonnade}.

Source : WordNet®

peristyle
     n : a colonnade surrounding a building or enclosing a court