sea oak

noun

Definition of sea oak

  1. 1 :  any of various rockweeds (especially Fucus vesiculosus and F. serratus)

  2. 2 British :  a sertularian hydroid (Dynamena punila) that forms a small much-branched arborescent colony with a tough horny skeleton into which the polyps can contract

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a rounded knoll or a ridge of ice

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