fucus

noun4

1. •
   Any alga of the genus Fucus.

   • Sea-weeds, consisting of different species of fuci, algae, and confervae, are much used as a manure on the sea-coasts of Britain and Ireland. — 1813
2. •
   (no longer used) A skin cosmetic, a wash or colouring for the skin.
3. •
   (no longer used) Any dye or colouring.
4. •
   (figurative, no longer used) A veil, pretense, mask; an artifice, deception.