1. Portuguese man-of-war, man-of-war, jellyfish, siphonophore

usage: large siphonophore having a bladderlike float and stinging tentacles

2. jellyfish, coelenterate, cnidarian

usage: any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans

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See also: jellyfish (Dictionary)