[1] : The Collaborative International Dictionary of English v.0.48

portuguese \por"tuguese\, a. cf. f. portugais, sp. portugues,
   pg. portuguez.
   of or pertaining to portugal, or its inhabitants. -- n. sing.
    pl. a native or inhabitant of portugal; people of portugal.
   1913 webster

   portuguese man-of-war. zool. see physalia.
      1913 webster
see also:
portuguese man-of-war physalia 

[2] : The Collaborative International Dictionary of English v.0.48

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
see also:
men-of-war portuguese man-of-war man-of-war hawk man-of-war's man physalia 

[3] : WordNet (r) 2.0

portuguese man-of-war
     n : large siphonophore having a bladderlike float and stinging
         tentacles syn: man-of-war, jellyfish
see also:
man-of-war jellyfish 

Man-Of-War >> M Words
Man-Of-War, definition of term: Man-Of-War
man-of-war_pag1.html

Portuguese >> P Words
Portuguese, definition of term: Portuguese
portuguese_pag1.html

Portuguese Man- >> P Words
Portuguese Man-, definition of term: Portuguese Man-
portuguese+man-_pag1.html