il·lu·mi·nant /-nənt/
  (a.)發光的光源,發光體
  il·lu·mi·nant /-nənt/ 名詞
  發光物,照明劑,照明的,發光的,發光體,光源
  Il·lu·mi·nant n.  That which illuminates or affords light; as, gas and petroleum are illuminants.
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  illuminant
       n : something that can serve as a source of light