protect, hide, or conceal from danger or harm
common aquatic plant of eastern North America having floating and submerged leaves and white yellow-spotted flowers
aquatic plant with floating oval leaves and purple flowers; in lakes and slow-moving streams; suitable for aquariums
(of a leaf shape) round, with the stem attached near the center of the lower surface rather than the margin (as a nasturtium leaf for example)
a protective covering or structure
