Costus root refers to the root of the plant *Saussurea costus*, which is native to the Himalayan region and parts of Asia. It is known for its use in traditional medicine and as a flavoring agent. The root has a strong, aromatic fragrance and is often used in herbal remedies and perfumery. Additionally, costus root may also refer to other plants in the Costus genus, which are used for similar purposes.
