Portuguese man-of-war

//ˈpɔː.tʃʊˌɡiːz ˌmæn.ə(v)ˈwɔː// noun

Definitions

Noun
  1. 1
    Physalia physalis, a marine cnidarian consisting of a floating colony of hydrozoans attached to a float, superficially resembling a jellyfish.

    "However, two beaches in Tarragona in southern Catalonia were closed in July after Portuguese man o’war (Physalia physalis) were spotted in the water."

  2. 2
    large siphonophore having a bladderlike float and stinging tentacles wordnet
  3. 3
    Used other than figuratively or idiomatically: see Portuguese, man-of-war.

Etymology

From Portuguese (adjective) + man-of-war, from the resemblance of the organism’s float to a former Portuguese warship at full sail.

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