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Noun: mustard tree
  1. Evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock
    - tree tobacco, Nicotiana glauca
     
  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
    - toothbrush tree, Salvadora persica

Derived forms: mustard trees

Type of: fruit tree, tobacco, tobacco plant

Part of: genus Salvadora, Salvadora