Source : Webster's Revised Unabridged Dictionary (1913)

Cubism \Cu"bism\ (k[=u]"b[i^]z'm), n. (Painting)
   A movement or phase in post-impressionism (which see, below).
   -- {Cu"bist}, n.

Source : WordNet®

cubist
     adj : relating to or characteristic of cubism; "cubist art" [syn:
           {cubistic}]

cubist
     n : an artist who adheres to the principles of cubism