tree heath n 1: gaunt Tasmanian evergreen shrubby tree with slender tapering leaves 3 to 5 feet long [syn: {grass tree}, {Richea pandanifolia}] 2: evergreen treelike Mediterranean shrub having fragrant white flowers in large terminal panicles and hard woody roots used to make tobacco pipes [syn: {briar}, {brier}, {Erica arborea}]