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 ]

n. (Zool.), The frigate bird, a long-billed warm-water seabird with wide wingspan and forked tail; also applied to the skua gulls, and to the wandering albatross. [ WordNet 1.5 ]