Webster's English Dictionary

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anthraquinone

an.thra.qui.none \.an(t)-thr*-kwin-'o-n, -'kwin-.o-n\ n [prob. fr. F, fr. 
   anthracene + quinone] : a yellow crystalline ketone C14H8O2 derived from 
   anthr acene and used esp. in the manufacture of dyes