Webster's English Dictionary

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arborvitae

ar.bor.vi.tae \.a:r-b*r-'vi-t-e-\ n [NL arbor vitae, lit., tree of life] : 
   any of various evergreen trees (esp. genus Thuja) of the pine fami ly usu. 
   with closely overlapping or compressed scale leaves that are often grown 
   for ornament and hedges