1. (Bot.) 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. Note: The name is extended to other species of the genus, and to some unrelated plants, as Indian tobacco (Nicotiana rustica, and also Lobelia inflata), mountain to...
