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).
Sleep, rapid eye movement
Sleep, rapid eye movement: REM sleep is the portion of sleep when there are rapid eye movements (REMs). Dreams occur during REM sleep. We typically have 3 to 5 periods of REM sleep per night. They occur at intervals of 1-2 hours and are…
Read the definitionRandom terms
Show more- Test, tilt-table Tilt-table testing involves placing the patient on a table with a foot-support. The table is tilted upward…
- Human reproductive cloning HTLV. A retrovirus that causes adult T-cell leukemia. HTLV is endemic (constantly present) in southern Japan…
- Mitral valve prolapse Mitral valve prolapse: Drooping down or abnormal bulging of the mitral valve's cusps backward into the atrium…
- Preauricular tag A common minor anomaly, this is a rudimentary tag of ear tissue. It often contains a core of cartilage. The…
- VCUG Voiding cystourethrography. Or voiding cystourethrogram
- Sigmoidoscopy, flexible Inspection of the inside of the rectum and lower part of the colon using a thin flexible lighted tube (a…
- Anlage 1. In biology, whatever precedes something else. 2. In embryology, a precursor or forerunner or a more mature…
- Acetaminophen Our Acetaminophen Main Article provides a comprehensive look at the who, what, when and how of Acetaminophen…
- Aromatase An enzyme involved in the production of estrogen that acts by catalyzing the conversion of testosterone (an…
- Antisense DNA DNA normally has two strands, i.e., the sense strand and the antisense strand. In double-stranded DNA, only…
- Familial Parkinson disease type 1 A familial form of Parkinson disease inherited in an autosomal dominant manner due to mutation in the…
- Dr. Andrew Weil Dr. Andrew Weil is a physician and proponent of alternative medicine. Dr. Weil is the Director and founder of…