nounpl. wap·a·tos or wap·a·toes
- Either of two North American arrowheads (Sagittaria latifolia or S. cuneata) of marshy shorelines, having sagittate leaves and submerged rhizomes that produce thick round tubers. Also called broadleaf arrowhead.
- One of the starchy edible tubers of these plants, a traditional food for various Native American peoples. In both senses also called duck potato, Indian potato.