Definition: Artemisin, originally, refers to a plant. It's also used in medicine and has medicinal uses. In scripture, it means "The herb for curing diseases." Definition: The Latin term artemisinium (literally, 'the herb', but more commonly 'herb') is the name of a specific type of medicinal plant that is said to be able to cure certain types of infectious diseases. Artemisinin, which contains artemisinium, has been used historically in various forms, including tea and medication. It's thought to have originated with an ancient Chinese herbalist named Cusine.