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).
Sleep, REM
Sleep, REM: 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 quite variable in…
Read the definitionRandom terms
Show more- Central venous line A catheter (tube) that is passed through a vein to end up in the thoracic (chest) portion of the vena cava…
- Somnambulist Sleep talking. Talking in one's sleep is considered a normal phenomenon that is of no medical or…
- Fear of insects An abnormal and persistent fear of insects. Sufferers of this fear experience undue anxiety even though they…
- Frambesia Also known as yaws, frambesia is a common chronic infectious disease that occurs mainly in the warm humid…
- Chromatids The daughter strands of a duplicated chromosome joined together by a centromere.
- Syndrome, McKusick-Kaufman A genetic disorder in which there is build-up of fluids (called hydrometrocolpos) in the vagina and the…
- RNA inactivation A technique for inactivating genes in a cell through the introduction of double-stranded RNA into the cell…
- Extension The process of straitening or the state of being strait. Extension of the hip and knee joints is necessary to…
- Lysenkoism A theory put forth by a Russian plant-breeder named Trofim Denisovich Lysenko [1898-1976] during the…
- Abrin A phytotoxin (plant poison) found in the seeds of a plant called the rosary pea or jequirity pea. These seeds…
- Locked-in syndrome A neurological disorder characterized by complete paralysis of voluntary muscles in all parts of the body…
- Thai hemorrhagic fever A syndrome due to the dengue virus that tends to affect children under 10, causing abdominal pain, hemorrhage…