1. Latin: “tree of life”.
2. Neuroanatomy: the cerebellar white matter in the brain, so called for its branched, tree-like appearance. It brings sensory and motor information to and from the cerebellum.
3. Female reproduction: “arbor vitæ uteri” - a part of the canal of the cervix.
4. Victorian slang: the penis.
[Benny Andersson - Tree of Life]