The National Library of Medicine is a renowned medical research institution in the United States that provides access to a wide range of medical and health-related materials. However, there are various synonyms for the National Library of Medicine, which can be used interchangeably depending on the context. Some of these synonyms include the NLM, the United States National Library of Medicine, and the National Institutes of Health Library. Others include the USNLM, the National Medical Library, and the American Medical Association Library. Additionally, the NLM is frequently referred to as the world's largest medical library due to its vast collection of biomedical literature and resources.