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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Disclaimer: the content is for informational and educational purposes only and does not replace medical advice. If you have doubts about your health, always consult a qualified professional. In case of emergency call your local emergency number (911 in the US, 112 in the EU).
Pupil
The opening of the iris. The pupil may appear to open (dilate) and close (constrict) but it is really the iris that is the prime mover; the pupil is merely the absence of iris. The pupil determines how much light is let into the eye. Both…
Read the definitionRandom terms
Show more- Galeophobia An abnormally large and persistent fear of sharks. Sufferers from this phobia experience anxiety even though…
- Nonocular type Stickler syndrome Stickler syndrome, type III. See: Stickler syndrome
- Syndrome, Martin-Bell Better known as the fragile X syndrome, the most common heritable form of mental retardation. Fragile X…
- Splenic artery A large artery within the abdomen that arises from an arterial vessel called the celiac trunk, which emerges…
- EPO (erythropoietin) Erythropoietin): A hormone produced by the kidney that promotes the formation of red blood cells in the bone…
- Injury, scooter See: Scooter injury
- Calcaneal spur A bony spur projecting from the back or underside of the heel bone (the calcaneus) that often makes walking…
- Q bands A form of chromosome band, one of the bright and dull fluorescent bands seen alternating along the length of…
- Cell sorter, fluorescence-activated A flow cytometer (a scientific instrument used to measure the characteristics of individual cells) that is…
- Amaurotic familial idiocy An outdated term for Tay-Sachs disease (TSD) which is concisely defined by OMIM (Online Mendelian Inheritance…
- Pancreas, artificial A machine that constantly measures glucose (sugar) in the blood and, in response to an elevated level of…
- Spasm A brief, automatic jerking movement. A muscle spasm can be quite painful, with the muscle clenching tightly…