Plural of fucus, referring to multiple seaweeds or rockweeds, especially of the genus Fucus.
From Latin fucus, meaning seaweed or paint/cosmetic (transferred meaning from the algae itself). The Latin root may derive from Greek phukes. The plural form follows Latin conventions.
In ancient times, Romans used actual seaweed as a cosmetic product—they'd apply it to their skin for beauty treatments, which is why the Latin word for seaweed also meant 'paint' or 'makeup.' It's the origin of words like 'fuscation' meaning false appearance.
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