noun Date: 1583 any of various coarse brown algae (order Fucales, especially genera Fucus, Ascophyllum, and Sargassum ) growing in marine environments free-floating or attached to rocks
ROCKWEED
Meaning of ROCKWEED in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012