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).
Null mutation
A mutation (a change) in a gene that leads to its not being transcribed into RNA and/or translated into a functional protein product. For example, a null mutation in a gene that usually encodes a specific enzyme leads to the production of…
Read the definitionRandom terms
Show more- Ultrasound/Ultrasonography A test in which high-frequency sound waves (ultrasound) are bounced off tissues and the echoes are converted…
- Infectivity The proportion of persons exposed to an infectious agent who become infected by it
- Innate immunity Immunity that is naturally present and is not due to prior sensitization to an antigen from, for example, an…
- Stroma The supportive framework of an organ (or gland or other structure), usually composed of connective tissue…
- Penetrant trait A genetic trait (characteristic) that is present in the genome and manifests itself in the individual. By…
- Disease, Canavan A severe progressive inherited (genetic) disorder of the central nervous system (CNS). The signs of Canavan…
- Laparoscopic 1. Pertaining to the procedure of laparoscopy.2. Pertaining to a laparoscope, the instrument by which…
- Electrophysiologic Pertaining to electrophysiology
- Exclamation point hair Exclamation point hair is a key diagnostic finding in a disorder called alopecia areata. Alopecia areata is…
- Nurses Health Study A very large and important prospective investigation into the risk factors for major chronic diseases in…
- Monoclonal Pertaining to a single clone of cells, a single cell and the progeny of that cell. As opposed to polyclonal…
- True rib One of the first 7 pairs of ribs. A rib is said to be 'true' if it attaches to the sternum (the breast bone)…