Online Medical Dictionaries

The medical dictionary websites listed below provide definitions for medical terms that you may hear your health care team use. ASCO does not control or endorse the information offered by these sites but provides these links as an educational resource to Cancer.Net visitors.

National Cancer Institute's Dictionary of Cancer Terms: This dictionary contains more than 6,000 terms related to cancer and medicine. You can also find a Spanish version of the dictionary.

Medline Plus: A service of the U.S. Library of Medicine and National Institutes of Health, the online medical dictionary uses the Merriam-Webster medical dictionary and includes pronunciation, along with definitions.

MedicineNet.com: MedTerms online medical dictionary is the medical reference for MedicineNet.com, containing easy-to-understand explanations of more than 16,000 medical terms.

The National Human Genome Research Institute Talking Glossary of Genetic Terms: This glossary lists more than 200 terms to help people understand terms used in genetic research.