Black pepper (Piper nigrum) is a flowering vine in the family Piperaceae, cultivated for its fruit which is usually dried and used as a spice and seasoning, known as a peppercorn. When fresh and fully mature, it is approximately 5 millimetres (0.20 in) in diameter and dark red, and contains a single seed like all drupes. Peppercorns, and the powdered pepper derived from grinding them, may be described simply as pepper, or more precisely as black pepper, white pepper, or green pepper. Green peppercorns are simply the immature black peppercorns. Dried ground pepper has been used since antiquity both for its flavour and as a traditional medicine. Black pepper is the world's most traded spice and is one of the most common spices added to cuisines around the world.