Source : WordNet®

water-shield
     n 1: aquatic plant with floating oval leaves and purple flowers;
          in lakes and slow-moving streams; suitable for aquariums
          [syn: {Brasenia schreberi}, {water-target}]
     2: common aquatic plant of eastern North America having
        floating and submerged leaves and white yellow-spotted
        flowers [syn: {fanwort}, {Cabomba caroliniana}]