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.
- 100% free
- No registration
- No intrusive ads
- Privacy by design
- Mobile friendly
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).
Atrial fibrillation
Atrial fibrillation: Abnormal irregular heart rhythm with chaotic generation of electrical signals in the atria of the heart. Familiarly called atrial fib.
Read the definitionRandom terms
Show more- Headache, cluster A distinctive syndrome of headaches, also known as migrainous neuralgia. There are two main clinical patterns…
- Juvenile polyposis coli See: Juvenile polyposis
- Medical word origin See: Medical etymology
- Oxygen tent A tent-like device used to deliver high levels of oxygen to a patient in a bed. The tent typically covers the…
- Licensed clinical social worker A social worker trained in psychotherapy who helps individuals deal with a variety of mental health and daily…
- Echopraxia The involuntary imitation of the movements of another person. Echopraxia is a feature of schizophrenia…
- Foot The end of the leg on which a person normally stands and walks. The foot is an extremely complex anatomic…
- Meckel's diverticulum An outpouching from the small intestine, due to failure of obliteration of the yolk stalk (which normally…
- Moraxella kingae See: Kingella kingae
- Episclera A thin membrane that covers the sclera (the white of the eye). 'Epi-' is a prefix from the Greek that means…
- Weasand 1. The windpipe (trachea). 2. More loosely, the throat. 'Cut his weasand with thy knife.' The Tempest…
- Lining, uterine The inner layer of the uterus (womb); the cells that line the womb; anatomically termed the endometrium. This…