WordReference Random House Learner's Dictionary of American English © 2020
ar•bor•vi•tae /ˌɑrbərˈvaɪti/USA pronunciation   n. [countable]
  1. Plant Biologyan evergreen tree of the cypress family.

WordReference Random House Unabridged Dictionary of American English © 2020
ar•bor vi•tae  (ärbər vītē),USA pronunciation [Anat.]
  1. Anatomya treelike appearance in a vertical section of the cerebellum, due to the arrangement of the white and gray nerve tissues.

ar•bor•vi•tae  (är′bər vītē),USA pronunciation n. 
  1. Plant Biologyany 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.
  2. AnatomySee  arbor vitae. 
  • Latin: tree of life
  • 1655–65 for def. 1; 1790–1800 for def. 2;

Collins Concise English Dictionary © HarperCollins Publishers::
arbor vitae /ˈɑːbɔː ˈviːtaɪ; ˈvaɪtiː/ n
  1. 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
Etymology: 17th Century: from New Latin, literally: tree of life
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