Portuguese man-of-war: Meaning and Definition of

Por'tuguese man-of-war'

Pronunciation: [key]
  1. any of several large, oceanic hydrozoans of the genus Physalia, having a large, bladderlike structure with a saillike crest by which they are buoyed up and from which dangle tentacles with stinging cells.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.