A buttress root.
A buttress-root is a root growing from the above-ground stem or trunk, providing support.
A taproot
acacia is a taproot
The HI2 answer is taproot.
Fibrous root
The carrot plant's root system is a taproot
A buttress root is NOT called a prop root. A buttress root is a big, thick, snake-like root that runs on the surface of the ground near the tree and helps to hold the tree firmly in place. A prop root/stilt root is a root that grows out of a branch and grows down to the ground to enter into the earth and to help hold the plant steady.
There are two types of root systems. taproot system and the fibrous root system.
Taproot.
Taproot!
I think you are refering to a taproot coming from the center of the root structure this is the main root for tree to live
It is called a taproot.