mustard tree meaning and definition

MUSTARD TREE noun

Definition of mustard tree (noun)

1. evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock
   • synonyms: Nicotiana glauca, tree tobacco
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
   • synonyms: Salvadora persica, toothbrush tree