Definition of wild tobacco
1 : any of several plants of the genus Nicotiana: such as a : a shrubby poisonous South American herb (N. glauca) widely naturalized —called also marijuana, tree tobacco b : an herb (N. rustica) of eastern North America formerly cultivated by the Indians
2 : a tropical shrub (Solanum verbascifolium) with white flowers and yellow fruit
3 : a tropical American herb (Pluchea odorata) with aromatic foliage and pink flowers
4 : indian tobacco 1
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