Webster's English Dictionary

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prismatic

pris.mat.ic \priz-'mat-ik\ \-i-k(*-)le-\ aj 1: relating to, resembling, or 
   constituting a prism  2a: formed by a prism  2b: resembling the colors 
   formed by refraction of light through a prism (~ effects} 3: highly colored 
   : BRILLIANT  4: having such symmetry that a general form with faces cutting 
   all axes at  unspecified intercepts is a prism {~ crystals} - 
   pris.mat.i.cal.ly av