MedicalVocabulary.org
Medical vocabulary with 16,436 clear, complete and reliable definitions.
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The most complete online medical dictionary: 16,436 terms covering anatomy, physiology, pathologies, diagnostic exams, pharmacology and every clinical specialty.
Designed for 3 kinds of users:
- Patients and family who want to understand a diagnosis, a medical report or instructions from a doctor.
- Students of medicine, nursing, physiotherapy and the health professions, dealing with technical terminology.
- Doctors, pharmacists and healthcare workers who need a quick and reliable reference.
Definitions are written in clear, accessible language while keeping the rigor required for professional use. Each term has a dedicated URL, instant autocomplete search, and can be shared on WhatsApp, Facebook, X and via email with one click.
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Na (sodium)
Na is the chemical symbol for sodium. From natrium, a synonym for sodium. Sodium is the major positive ion (cation) in fluid outside of cells. The chemical notation for sodium is Na+. When combined with chloride (Cl), the resulting…
Read the definitionRandom terms
Show more- Ebola virus A notoriously deadly virus that causes fearsome symptoms, the most prominent being high fever and massive…
- Effacement The thinning of the cervix which occurs before and while it dilates
- Hereditary ALS See: Familial ALS
- Cataract, secondary A cataract that develops secondary to another disease or surgery. The other disease may, for example, be…
- Infantile genetic agranulocytosis Children born with this condition lack neutrophils (a type of white blood cell that is important in fighting…
- Syndrome, carcinoid A syndrome due to carcinoid tumor which secretes large amounts of the hormone serotonin. The syndrome is…
- Alimentary canal The digestive tract. See: Gastrointestinal tract
- Gastric stapling A surgical procedure that converts the upper part of the stomach into a very small pouch by stapling portions…
- Variation, observer Failure by the observer to measure accurately, resulting in error. Observer variation may be due to the…
- Parotids Salivary glands situated in front of the ears.
- Shock, psychologic Trauma due to psychological events, as in 'shell shock' (now known as post-traumatic stress disorder)
- Dengue fever Dengue fever: An acute mosquito- borne viral illness of sudden onset that usually follows a benign course…