noun the leaves of the plant prepared for smoking, chewing, ·etc., by being dried, cured, and manufactured in various ways.
2. tobacco ·noun 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.