Large siphonophore having a bladderlike float and stinging tentacles; Also called: man-of-war, jellyfish.
Any of a genus Physalia of phylum Coelenterata (see coelenterate). They live in the sea, in colonies, and have a large air-filled bladder (or “float”) on top and numerous hanging tentacles made up of feeding, stinging, and reproductive individuals. The float can be 30 cm/1 ft long.