Webster's English Dictionary

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luminary

lu.mi.nary \'lu:-m*-.ner-e-\ n [ME luminarye, fr. MF & LL; MF luminaire 
   lamp, fr. LL luminaria)X, pl. of luminare lamp, heavenly body, fr. L, 
   window, fr. lumin-, lumen light; akin to L luce-re to shine - more at LIGHT 
   1: one who is notable in his chosen field  2: an artificial light  3: a 
   body that gives light; esp : one of the heavenly bodies  - luminary aj