n; pl. Men-of-war. 1. A government vessel employed for the purposes of war, esp. one of large size; a ship of war. [ wns=1 ] Syn. -- ship of the line. [ 1913 Webster ] 2. The Portuguese man-of-war. Syn. -- , jellyfish. [ WordNet 1.5 ] Man-of-war hawk (Zool.), the frigate bird. -- Man-of-war's man, a sailor serving in a ship of war. -- Portuguese man-of-war (Zool.), any species of the genus Physalia; it is a hydrozoan having both medusa and polyp stages present in a single colony. It floats on the surface of the sea by a buoyant bladderlike structure, from which dangle multiple long tentacles with stinging cells. Its can cause severe rashes when it comes in contact with humans swimming in the area. See Physalia. [ 1913 Webster ]
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