Dendrology root definition

What is the meaning of root of a tree?
“Tree” and “true,” for instance, share the same Indo-European root – “deru-” meaning firm, solid and steadfast.
The physical sense of strength in “deru-” gave us the Old English “treow” (tree), while the abstract sense of reliability in “deru-” produced the Old English “treowe” (true)..
“Tree” and “true,” for instance, share the same Indo-European root – “deru-” meaning firm, solid and steadfast.
The physical sense of strength in “deru-” gave us the Old English “treow” (tree), while the abstract sense of reliability in “deru-” produced the Old English “treowe” (true).

Dendrology (Ancient Greek: δένδρον, dendron, "tree"; and Ancient Greek: -λογία, -logia, science of or study of) or xylology (Ancient Greek: ξύλον, ksulon, "wood") is the science and study of woody plants (trees, shrubs, and lianas), specifically, their taxonomic classifications.

Dendrology root definition

What is the meaning of root of a tree?