tuber

US /ˈtuː.bɚ/
UK /ˈtuː.bɚ/
"tuber" picture
1.

tubérculo

a swollen underground stem in some plants, e.g., potato, from which new plants grow

:
Potatoes are a common example of a tuber.
Batatas são um exemplo comum de tubérculo.
Dahlias grow from a fleshy tuber.
Dálias crescem de um tubérculo carnudo.