arbor vitae

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arborvitae
white cedar
Thuja occidentalis

ar·bor·vi·tae

also ar·bor vi·tae (är′bər-vī′tē)
n.
1. Any of various coniferous evergreen trees or shrubs of the genus Thuja of North America and eastern Asia, having flattened branchlets with opposite, scalelike leaves and small cones. They are grown as ornamentals and for timber. Also called thuja.
2. Any similar plant of the related genera Platycladus or Thujopsis.
3. Anatomy The white nerve tissue of the cerebellum, which has a treelike outline in a median section.

[From New Latin arbor vītae, tree of life : Latin arbor, tree + Latin vītae, genitive of vīta, life; see vital.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

arbor vitae

(ˈɑːbɔː ˈviːtaɪ; ˈvaɪtiː) or

arborvitae

n
(Plants) 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. See also red cedar
[C17: from New Latin, literally: tree of life]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014