- any of several plants belonging to the genus Nicotiana, of the nightshade family, especially one of those species, as N. tabacum, whose leaves are prepared for smoking or chewing or as snuff.
- the prepared leaves, as used in cigarettes, cigars, and pipes.
- any product or products made from such leaves.
- any of various similar plants of other genera.
- any of numerous solanaceous plants of the genus Nicotiana, having mildly narcotic properties, tapering hairy leaves, and tubular or funnel-shaped fragrant flowers. The species N. tabacum is cultivated as the chief source of commercial tobacco
- the leaves of certain of these plants dried and prepared for snuff, chewing, or smoking
