Definition of tuber noun from the Oxford Advanced Learner's Dictionary

 

tuber

 noun
noun
BrE BrE//ˈtjuːbə(r)//
 
; NAmE NAmE//ˈtuːbər//
 
 
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the short thick round part of an underground stem or root of some plants, such as potatoes, which stores food and from which new plants grow Word Origin mid 17th cent.: from Latin, literally ‘hump, swelling’.
See the Oxford Advanced American Dictionary entry: tuber