Arbor vitae

1. The treelike disposition of the gray and white nerve tissues in the cerebellum, as seen in a vertical section.
2. An evergreen tree of the cypress tribe, genus Thuja. The American species is the T. occidentalis.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.