Medical Dictionary

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Welcome to the Free Medical Dictionary


In Medicine, words have very specific meanings and are carefully used. is a lookup guide to the essential language of Medicine. is easy-to-use and comprehensive - the ideal quick reference guide for health care professionals and laypersons alike. It provides clear and instructive definitions, abbreviations, phrases and acronyms.

With over 40,000 entries in its database, covers a vast array of medical terminology. Among many others, you may search for medical terms related to:

  • Alternative Medicine
  • Cancer
  • Diabetes
  • Eye Disease
  • Medical Abbreviations is designed to assist in the understanding of medical terminology. It is not intended to replace the services of a physician. The medical terminology on is provided for informational purposes only and is not a substitute for professional medical advice. You should not use the information on for diagnosing a medical or health condition. You should consult a physician in all matters relating to your health, and particularly in respect to any symptoms that may require diagnosis or medical attention.

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Term of the day

capillary leak syndrome

A condition in which fluid and proteins leak out of tiny blood vessels and flow into surrounding tissues, resulting in dangerously low blood pressure. Capillary leak syndrome may lead to multiple organ failure and shock.   
NCI Dictionary of Cancer Terms, by the National Cancer Institute.

Popular Terms

Other Resources



Merriam-Webster's Medical Dictionary

MedlinePlus: Medical Encyclopedia

MedlinePlus: Medical Dictionary

Online Medical Dictionary

TheFreeDictionary: Medical Dictionary

MedTerms Medical Dictionary


InteliHealth Health Portal

Mercksource (Dorland's Illustrated Medical Dictionary)

eMedicine (Stedman's Medical Dictionary)

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