MedicalVocabulary.org
Medical vocabulary with 16,436 clear, complete and reliable definitions.
About MedicalVocabulary.org
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).
Cation
In chemistry, a positively charged ion. Pronounced cat-I-on. A cation is as opposed to an anion, which is a negatively charged ion.
Read the definitionRandom terms
Show more- Fever, relapsing See: Relapsing fever
- D-IBS Diarrhea-predominant IBS (irritable bowel syndrome)
- Cardiac Having to do with the heart
- Eye cataract A clouding of the lens of the eye. The normally clear aspirin-sized lens of the eye starts to become cloudy…
- HHT Abbreviation for the disease called hereditary hemorrhagic telangiectasia. See: Hereditary hemorrhagic…
- Accessory placenta An extra placenta separate from the main placenta. Also called a succenturiate or supernumerary placenta. The…
- Syndrome, Werner A premature aging disease that begins in adolescence or early in adulthood and results in apparent old age by…
- Thoracic outlet syndrome Thoracic outlet syndrome: A condition due to compromise of blood vessels or nerve fibers between the armpit…
- Pyelo Short for pyelonephritis, which is bacterial infection of the kidney. Pyelonephritis can be acute (sudden) or…
- Parathyrin A small tumor of the parathyroid gland and the most common disorder of the gland. Parathyroid adenomas are…
- Zenker diverticulum The most common type of outpouching in the esophagus, due to increased pressure causing the mucous membrane…
- Naturopathic medicine See: Naturopathy