pronunciation: IPA: /treːow/
1. truth, fidelity
2. large woody plant; tree (noun)
An Old English word, treow means “tree” or “oak tree”. The oak tree was common to Indo Europeans and they began to call all trees by this. The word “oak” was later changed to mean oak tree. “Tree” is related to “true”, which meant "steady or firm", a lot like an oak tree.