GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Man-of-war , n; pl. Men-of-war.
   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
   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