wapato

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wap·a·to

 (wŏp′ə-tō′)
n. pl. wap·a·tos or wap·a·toes
1. 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.
2. 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.