sweet potato: the edible tuberous root of the sweet potato vine which is grown widely in warm regions of the United States
root vegetable: any of various fleshy edible underground roots or tubers
tardigrada: in some classifications considered a separate phylum: microscopic arachnid-like invertebrates living in water or damp moss having 4 pairs of legs and instead of a mouth a pair of stylets or needlelike piercing organs connected with the pharynx