white cedar noun5 •An Atlantic white cypress (Chamaecyparis thyoides). •An evergreen coniferous tree, of species Thuja occidentalis, native to the northeastern US and southeastern Canada. •A Mexican white cedar (Cupressus lusitanica) •A chinaberry shrub (Melia azedarach), in family Meliaceae. •A tree of species Tabebuia heterophylla, of the Caribbean and South America, in family Bignoniaceae. formswhite cedars