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From The Collaborative International Dictionary of English v.0.48:
Fucus \Fu"cus\, n.; pl. Fuci. [L. rock lichen, orchil, used as a red dye, red or purple color, disguise, deceit.] 1. A paint; a dye; also, false show. [Obs.] [1913 Webster] 2. (Bot.) A genus of tough, leathery seaweeds, usually of a dull brownish green color; rockweed. [1913 Webster] Note: Formerly most marine alg[ae] were called fuci. [1913 Webster]