Definition of knotted wrack in English:

knotted wrack

Line breaks: knot|ted wrack

Entry from British & World English dictionary

noun

[mass noun]
  • A dark olive-green seaweed with flat branching fronds which bear air bladders, occurring on rocky seashores.
    • Ascophyllum nodosum, class Phaeophyceae

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Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space