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(Plants) any algae of the phylum Phaeophyta, such as the wracks and kelps, which contain a brown pigment in addition to chlorophyll
any marine algae of the class Phaeophyceae, having brown pigments in addition to chlorophyll.
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|Noun||1.||brown algae - algae having the chlorophyll masked by brown and yellow pigments|
alga, algae - primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
kelp - large brown seaweeds having fluted leathery fronds
rockweed - coarse brown seaweed growing on rocks exposed at low tide