Definition of American arborvitae
: an evergreen tree (Thuja occidentalis) of eastern North America that has a conical or columnar form, reddish-brown bark, flattened branchlets in horizontal planes with closely attached scalelike leaves, and soft, decay-resistant wood and that has numerous ornamental cultivars —called also eastern arborvitae, eastern white cedar, swamp cedar, northern white cedar, white cedar, yellow cedar — compare oriental arborvitae
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