What defines a tuber?

tuber, specialized storage stem of certain seed plants. Tubers are usually short and thickened and typically grow below the soil. As modified stems, most tubers bear minute scale leaves, each with a bud that has the potential for developing into a new plant. The potato is a typical tuber, as is the Jerusalem artichoke.

What are examples of tubers?

Common examples edible of tubers include potatoes, jicama, sunchokes, and yams. Root tubers (like sweet potatoes or cassava) are often mistakenly classified within this category, but because they have swollen roots (rather than stems) they don’t fit the technical bill for what a true tuber is.