Tuber
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A tuber is a part of a rhizome thickened for use as a storage organ, usually, though not always, subterranean, such as a potato.
This should not be confused with a tuberous root such as a sweet potato or Dahlia, which is a similarly swollen root.
See also
de:Knolle es:Tubérculo eo:Tubero fr:Tubercule pl:Bulwa pt:Tubérculo