An American plant (Nicotiana Tabacum) of the Nightshade family, much used for smoking and chewing, and as snuff. As a medicine, it is narcotic, emetic, and cathartic. Tobacco has a strong, peculiar smell, and an acrid taste.
- Any of various plants of the genus Nicotiana, especially N. tabacum, native to tropical America and widely cultivated for their leaves, which are used primarily for smoking.
- The leaves of these plants, dried and processed chiefly for use in cigarettes, cigars, or snuff or for smoking in pipes.
- Products made from these plants.
- The habit of smoking tobacco: I gave up tobacco.
- A crop of tobacco.