Definition of swan potato
: a plant of the genus Sagittaria having tubers used as food: such as a : a common arrowhead (S. latifolia) of wetlands of the U.S. and southern Canada with starchy tubers once used extensively by American Indians b : a similar common Old World arrowhead (S. sagittifolia) that is sometimes cultivated in Japan and China
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Origin and Etymology of swan potato
alteration of swamp potato
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