Definitions
1.nounA kind of tree, the arborvitae.
2.nounA metaphor used to describe the relationships between organisms, both living and extinct, usually represented with a tree-like diagram.
3.nounA term used in the Hebrew Bible that is a component of the world tree motif.
4.nounThe central mystical symbol used in the Kabbalah of esoteric Judaism, also known as the 10 Sephirot.