Portuguese man-of-war
noun
plural Portuguese man-of-wars
also Portuguese men-of-war
Definition of Portuguese man-of-war
: any of a genus (Physalia of the family Physaliidae) of large tropical and subtropical pelagic siphonophorehydrozoans having a crested bladderlike float which bears the colony comprised of three types of zooids on the lower surface with one of the three having nematocyst-equipped tentacles
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