Answer: Botanically speaking a FRUIT is any ovary that has developed and matured. It also usually contains seeds. By this definition, many so-called vegetables, including tomatoes, string beans, cucumbers, and squashes, are really fruits. On the other hand, vegetables can consist of leaves (e.g., lettuce, cabbage), stems (e.g., white potato), roots (e.g., sweet potato), stems and roots (e.g., beets), flower buds (e.g., globe artichoke), or other parts of the plant. So, the answer to your question is yes, a potato is a tuber and all tubers are considered vegetables.
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