Medical glossary & resources
Understand medical terms and explore authoritative references. Educational only — not a substitute for professional diagnosis or emergency care.
Medical dictionaries
- MedlinePlus Medical Encyclopedia U.S. National Library of Medicine Trusted definitions of diseases, symptoms, tests, and treatments.
- Merriam-Webster Medical Dictionary Merriam-Webster Clear definitions of medical terms for patients and students.
- Understanding Medical Words (Tutorial) MedlinePlus Free tutorial on prefixes, roots, and suffixes in medical language.
Reference & health topics
- Merck Manual (Consumer Version) Merck & Co. Symptoms, diagnosis, and treatment overviews for the public.
- WHO Health Topics World Health Organization Global guidance on diseases, wellness, and health systems.
- OpenMD Medical Search OpenMD Search medical literature and terminology across sources.
Medical travel
- WHO International Travel & Health WHO Health advice for international travellers.
- CDC Travelers' Health U.S. CDC Vaccines, outbreaks, and destination-specific health notices.
Common word parts
Hyper-
High, excessive (e.g. hypertension)
Hypo-
Low, deficient (e.g. hypoglycemia)
Cardio-
Heart (e.g. cardiology)
Neuro-
Nerves / nervous system
Derma-
Skin (e.g. dermatology)
Gastro-
Stomach / digestive tract
Hema- / Hemo-
Blood
Osteo-
Bones