The Collaborative International Dictionary of English v.0.48:

Peribolos \Pe*rib"o*los\, n. [Nl., fr. Gr. peri`bolos, fr.
   peri`bolos, adj., going round, fr. periba`llein to throw
   round; cf. L. peribolus.]
   In ancient architecture, an inclosed court, esp., one
   surrounding a temple.
   [1913 Webster]