Webster's English Dictionary

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fucus

fu.cus \'fyu:-k*s\ n [L, archil, rouge, fr. Gk phykos seaweed, archil, 
   rouge, of Sem origin; a] [NL, genus name, fr. L]kin to Heb pu-kh antimony 
   used as a cosmetic obs  1: a face paint  2: any of a genus (Fucus) of 
   cartilaginous brown algae used in the ke lp industry; broadly : any of 
   various brown algae