tuber

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

bulwa

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

:
Potatoes are a common example of a tuber.
Ziemniaki są powszechnym przykładem bulwy.
Dahlias grow from a fleshy tuber.
Dalie rosną z mięsistej bulwy.