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Tuber

ˈtjuːbə

Tuber definitions
noun
tuber tubers
  1. a much thickened underground part of a stem or rhizome, e.g. in the potato, serving as a food reserve and bearing buds from which new plants arise
    • a tuberous root, e.g. of the dahlia
  2. a rounded swelling or protuberant part

    "tuber cinereum"