Tuber
/tˈubər/
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Definition
(noun) A fleshy, thickened underground stem of a plant, usually containing stored starch, for example a potato or arrowroot.
Sentence Examples
A potato is a common and starchy type of underground tuber.
A tuber is a thick part of an underground stem of a plant.
CEFR Practice Quiz
A potato is a type of edible ____ that grows underground and is a main source of food in many countries today.