Webster's English Dictionary

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brilliant

Cross references:
  1. bright                
 
1. bril.liant \'bril-y*nt\ aj [F brillant, prp. of briller to shine, fr. It 
   brillare, fr. (Xbrillo beryl, fr. L beryllus 1: very bright : GLITTERING {a 
   ~ light}  2a: STRIKING, DISTINGUISHED  2b: distinguished by unusual mental 
   keenness or alertness  - brilliant.ly av
2. brilliant n : a diamond or other gem cut in a particular form with 
   numerous facets so  as to have especial brilliancy