An order of colonial marine coelenterates that includes the Portuguese man-of-war, having a float or swimming bell for drifting or swimming on the open sea.
- ‘These creatures are probably relatives of the Siphonophora, an order of colonial cnidarians that includes the venomous ‘Portuguese man-o-war’.’
- ‘Jones' last publication on the subject of marine life was on the morphology and relationships of the Siphonophora.’
- ‘The Portuguese man-of-war is actually any of various invertebrate, jelly-like marine animals of the family Siphonophora.’
Modern Latin (plural), from Greek siphōn tube + pherein to bear.