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).
Serotonin
A hormone, also called 5-hydroxytryptamine, in the pineal gland, blood platelets, the digestive tract, and the brain. Serotonin acts both as a chemical messenger that transmits nerve signals between nerve cells and that causes blood…
Read the definitionRandom terms
Show more- Cystitis in children Bladder infection in children. See: Urinary tract infection in children
- Endoscopic retrograde cholangiopancreatography Abbreviated ERCP. A procedure done to diagnose and treat problems in the liver, gallbladder, bile ducts, and…
- Tracheostomy button Tracheostomy button: A 1/2- to 1 1/2-inch-long plastic tube placed in the stoma to keep it open
- Xen- (prefix) Foreign or other. As in: > >Xenoantigen -- An antigen that is found in more than one species. >Xenograft -- A…
- Beta agonist See: Beta-agonist
- Kostmann disease Children born with this condition lack neutrophils (a type of white blood cell that is important in fighting…
- Barotitis Middle ear problems due to changing atmospheric pressures, as when a plane descends to land. The problems…
- Muscle relaxant Muscle relaxant is a term usually used to refer to skeletal muscle relaxants (drugs), which act on the…
- Retinitis pigmentosa and congenital deafness (Also called Usher syndrome.) A genetic disorder characterized by hearing impairment and an eye disorder…
- Fornix In anatomy, a vaultlike or arched structure. For example: > >The fornix in the brain -- a fibrous arching…
- Blepharospasm Involuntary forcible closure of the eyelids. The first symptom may be uncontrollable blinking. Only one eye…
- Abrin A phytotoxin (plant poison) found in the seeds of a plant called the rosary pea or jequirity pea. These seeds…