Old World Herb is a term used to describe herbs that were used in traditional medicine and cooking before the introduction of modern medicine and food production. Two examples of Old World Herbs are Tansy (5 letters) and Henbane (7 letters). Tansy is an herbaceous perennial plant with yellow flowers that has been used for centuries as a medicinal herb and insect repellent. Henbane is a poisonous plant with white or yellow flowers that has been used for centuries as a sedative and pain reliever.