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xanthone

xanthone Chem.
  (ˈzænθəʊn)
  [f. Gr. ξανθός yellow + -one.]
  A compound which forms the basis of various natural colouring matters.

1894 Muir & Morley Watts' Dict. Chem. IV. 867 Xanthone is Diphenylene ketone oxide.

Oxford English Dictionary

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