- any of several ornamental or timber-producing evergreen trees belonging to the genus Thuja, of the cypress family, native to North America and eastern Asia, having a scaly bark and scalelike leaves on branchlets.
- arbor vitae.
- a treelike appearance in a vertical section of the cerebellum, due to the arrangement of the white and gray nerve tissues.
- any of several Asian and North American evergreen coniferous trees of the genera Thuja and Thujopsis, esp Thuja occidentalis, having tiny scalelike leaves and egglike cones
