The websites below offer medical dictionaries which define common medical terms. The information provided on these sites is not intended to substitute the information provided by your doctor. Always consult your doctor for more information. 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 4,000 terms related to cancer and medicine.

Diccionario de cáncer

Medline Plus

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

Stedman's

The Stedman's Online Medical Dictionary utilizes Stedman's Medical Dictionary, 27th Edition for its definitions.

MedicineNet.com

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

Read the four-part feature series on oncology terms.

Part I: Cancer Terms to Know: Basic Oncology Terms

Part II: Cancer Terms to Know: Newly Diagnosed

Part III: Cancer Terms to Know: During Treatment

Part IV: Cancer Terms to Know: After Treatment

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