Definition of fucus
1
obsolete
: a face paint
2
[New Latin, genus name, from Latin]
: any of a genus (Fucus) of leathery marine brown algae of rocky intertidal zones that are a source of algin and have been used as fertilizer
broadly
: any of various brown algae — compare rockweed
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Merriam-Webster unabridged
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Time Traveler for fucus
The first known use of fucus was in 1591
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