Webster's English Dictionary

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quinone

qui.none \kwin-'o-n, 'kwin-.o-n\ n [ISV, fr. quinine] 1: either of two 
   isomeric cyclic crystalline compounds C6H4O 2; esp : the pungent yellow 
   para isomer usu. made by oxidation of aniline and used esp. as an oxidizing 
   agent 2: a usu. yellow, orange, or red compound containing quinone 
   structures