Entry from British & World English dictionary
Definition of knotted wrack in English:
A dark olive-green seaweed with flat branching fronds which bear air bladders, occurring on rocky seashores.
- Ascophyllum nodosum, class Phaeophyceae
- Its eggs are laid in May and June, primarily on rock surfaces that, at low tide, are covered with the knotted wrack Ascophyllum nodosum.
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