men-of-war

Man-of-war \Man`-of-war"\, n; pl. {Men-of-war}.
   1. A government vessel employed for the purposes of war, esp.
      one of large size; a ship of war. [WordNet sense 1]

   Syn: ship of the line.
        [1913 Webster]

   2. The {Portuguese man-of-war}.

   Syn: 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]