The Collaborative International Dictionary of English v.0.48:

Periphrasis \Pe*riph"ra*sis\, n.; pl. Periphrases. [L.]
   See Periphrase.
   [1913 Webster] Periphrastic

WordNet (r) 3.0 (2006):

periphrasis
    n 1: a style that involves indirect ways of expressing things
         [syn: circumlocution, periphrasis, ambage]