arbor-vitae

Ar"bor vi"tæ. Etym: [L., tree of life.] 1. (Bot.) Defn: An evergreen tree of the cypress tribe, genus Thuja. The American species is the T. occidentalis. 2. (Anat.) Defn: The treelike disposition of the gray and white nerve tissues in the cerebellum, as seen in a vertical section.

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