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).
Cranial nerve, fourth
The fourth cranial nerve, the trochlear nerve, is the nerve supply to the superior oblique muscle of the eye, one of the muscles that moves the eye. Paralysis of the trochlear nerve results in rotation of the eyeball upward and outward…
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Show more- Tranquilizer In pharmacology, a drug that calms and relieves anxiety. The first tranquilizer, chlordiazepoxide…
- Portal vein A large vein that carries blood from the stomach and the intestines to the liver. The portal vein is formed…
- Encephalitis, St. Louis A disease caused by a virus (first observed in Illinois in 1932) transmitted from birds to the common Culex…
- Local therapy Treatment that affects only a tumor and the area close to it.
- Menstrual irregularity The normal menstrual cycle is about four weeks long, and often follows the phases of the moon. Its length…
- Meningitis, aseptic Inflammation of the meninges that is not caused by bacterial infection. Viral meningitis is the most common…
- Kiss A touch or caress with the lips. 'The anatomical juxtaposition of two orbicularis oris muscles in a state of…
- Qualified health claim A claim authorized by the US Food and Drug Administration (FDA) that must be supported by credible scientific…
- Electrophysiologic retinal testing Testing done to diagnose specific disorders of the retina, including inherited retinal diseases, the effects…
- Rabies Rabies: A potentially fatal viral infection that attacks the central nervous system. The rabies virus is…
- Intersex A group of conditions sometimes referred to as disorders of sexual development (DSDs) in which there is a…
- Neurotransmitter A chemical that is released from a nerve cell which thereby transmits an impulse from a nerve cell to another…