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Definition of thuja
: any of a genus (Thuja) of evergreen shrubs and trees (such as an arborvitae) of the cypress family that are native to North America and eastern Asia, have flattened branchlets with closely overlapping scalelike leaves, and include various dwarf horticultural cultivars
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Origin and Etymology of thuja
New Latin Thuja, from Medieval Latin thuia, a cedar, from Greek thyia, from thyein to sacrifice — more at thyme
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