It's a root
An oak tree's roots are underground and anchors the tree to the ground. The roots also supplies the tree with water and nutrients. The branches support the leaves and acorns.
The roots of a plant anchor it in the ground and absorb water and nutrients from the soil.
their roots or rhizomes in mosses and ferns
roots
The part of the tree trunk that goes into the ground is called the "root." Roots anchor the tree and absorb water and nutrients from the soil. They also store energy and help support the tree's overall stability and health.
roots
root cap, root tip..
I think you mean Tree "STUMP". When a tree is chopped down, the part that is still left in the ground is called the Tree Stump.
To anchor a pergola securely to the ground, you can use concrete footings or metal post anchors. Dig holes for the footings or anchors, place them in the holes, and then secure the pergola posts to them using bolts or screws. Make sure the footings or anchors are deep enough and firmly set in the ground to provide stability for the pergola.
A tree broken over by storm forms a right triangle with the ground. If the broken part makes an angle 50o with the ground and if the top of the tree is now 20 ft from its base, how tall was the tree?
Thomas H. Hanna has written: 'Design and construction of ground anchors' 'Ground anchors in civil engineering' 'The behavior of long piles under compressive loads in sand'
It's called a Trunk...