tree heath tree·heath uncommon noun 1. gaunt Tasmanian evergreen shrubby tree with slender tapering leaves 3 to 5 feet long Synonymstree heathgrass treeRichea pandanifolia 2. evergreen treelike Mediterranean shrub having fragrant white flowers in large terminal panicles and hard woody roots used to make tobacco pipes Synonymstree heathbriarbrierErica arborea Related words Broader terms ericaAustralian heath Parts Richea Part of briarroot WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.