1. evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock • Syn: tree tobacco, Nicotiana glauca • Hypernyms: tobacco, tobacco plant 2. glabrous or pubescent evergreen shrub or tree of the genus Salvadora; twigs are fibrous and in some parts of the world are bound together in clusters and used as a toothbrush; shoots are used as camel fodder; plant ash provides salt • Syn: toothbrush tree, Salvadora persica • Hypernyms: fruit tree • Member Holonyms: Salvadora, genus Salvadora