FUCUS

fucus. Fucus, n. pl. fucuses, paint or dye, a genus of seaweeds

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Fu″cus (?), n.; pl. Fuci (#). [] 1. 1. A paint; a dye; also, false show.
2. 2. (Bot.) A genus of tough, leathery seaweeds, usually of a dull brownish green color; rockweed.
☞ Formerly most marine algæ were called fuci.