Eponyms are names or phrases derived from or including the name of a person or place. These terms are used in a descriptive or adjectival sense¹ in medical and scientific writing to describe entities such as diseases, syndromes, signs, tests, methods, and procedures. These eponymous terms should be distinguished from true possessives (eg, Homer's Iliad). Medical eponyms are numerous (a Web site devoted to medical eponyms lists more than 7000), are frequently used in medical publications, and are treated in dictionaries of eponyms covering general medicine³ and some specialties, eg, neurology. Eponyms historically have indicated the name of the describer or presumptive discoverer of the disease (eg, Alzheimer disease) or sign (eg, Murphy sign), the name of a person or kindred found to have the disease described (eg, Christmas disease), or, when based on the name of a place (technically, toponyms), the geographic location in which the disease was found to occur (eg, Lyme disease)...