IPA: /ˈruːtˌbɔːl/
KK: /ˈrutˌbɔl/
The mass of roots and soil that comes out when a plant is removed from the ground or a pot.
When we transplanted the tree, we made sure to keep the rootball intact.
Rootball → The word is formed from "root" (from Old English "wēod", meaning the part of a plant that attaches it to the ground) and "ball" (from Old French "balle", meaning a spherical object). A rootball refers to the mass of roots and soil that is often removed from the ground when transplanting a plant.
Think of the 'roots' of a plant being gathered into a 'ball' shape when it is moved — that's what a rootball is.