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