The Collaborative International Dictionary of English v.0.48:

Diallage \Di*al"la*ge\, n. [NL., fr. Gr. ? interchange, change,
   fr. ? to interchange.] (Rhet.)
   A figure by which arguments are placed in various points of
   view, and then turned to one point. --Smart.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Diallage \Di"al*lage\ (?; 277), n. [Gr. ? change, alluding to
   the change and inequality of luster between the natural
   joints of the mineral.] (Min.)
   A dark green or bronze-colored laminated variety of pyroxene,
   common in certain igneous rocks.
   [1913 Webster]