knotted wrack
English
    
    Noun
    
knotted wrack (plural knotted wracks)
- A species of brown algae, Ascophyllum nodosum; a common seaweed of the northern Atlantic Ocean.
Usage notes
    
- Also bladderwrack (Fucus vesiculosus) is commonly known as "rockweed".
Synonyms
    
Translations
    
Ascophyllum nodosum
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