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Entry 2 senses Webster, 1913

Sea trumpet

/sē trŭm'-pət/ · Sea· trum·pet · IPA
01 A great blackish seaweed of the Southern Ocean, having a hollow and expanding stem and a pinnate frond, sometimes twenty feet long.
  1. 1.
    A great blackish seaweed of the Southern Ocean, having a hollow and expanding stem and a pinnate frond, sometimes twenty feet long.(Bot.)
  2. 2.
    Any large marine univalve shell of the genus Triton. See Triton.(Zool.) See: Triton