tuber

Types:

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water chestnut

edible bulbous tuber of a Chinese marsh plant

groundnut, potato bean, wild bean

nutlike tuber; important food of Native Americans

Jerusalem artichoke

edible tuber of the Jerusalem artichoke

yam

edible tuber of any of several yams

Type of:

stalk, stem

a slender or elongated structure that supports a plant or fungus or a plant part or plant organ