Tuber (noun)

A thickened underground stem such as that of a potato, from which new plants can grow.

Origin:

Late middle english: from latin, literally "swelling", from tumere "to swell", from an indo-european root shared by tumulus and tumor.

Examples:

1. The farmer dug up the potatoes from the soil, revealing the tubers.
2. The tuber of the dahlia plant is used to propagate new plants.
3. The tubers of the sweet potatoes are edible and rich in carbohydrates.
4. The tubers of the orchid plant are small and difficult to locate.
5. Tubers are a key source of nutrition in many indigenous communities.