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- Gingiva The gum
- Yerba mate A stimulant beverage similar to tea, very popular in South America, brewed from the dried leaves and stemlets…
- Micro-RNA A tiny piece of RNA, about 21 to 23 bases in length, that binds to matching pieces of messenger RNA to make…
- Urination, difficulty See: Dysuria
- Facial nerve The facial nerve is the seventh cranial nerve. It is a mixed nerve that has fibers both going out and coming…
- Vaccine, flu The flu (influenza) vaccine is recommended for persons at high risk for serious complications from influenza…
- Radioimmunoassay A very sensitive, specific laboratory test (assay) using radiolabeled (and unlabeled) substances in an…
- Crimean-Congo hemorrhagic fever Fever: A viral disease characterized by hemorrhage (bleeding) and fever. Crimean-Congo hemorrhagic fever…
- Henoch-Schonlein purpura Henoch-Schonlein purpura: See: Schonlein-Henoch purpura.
- Microabscess A tiny abscess. A small accumulation of pus
- Aortic atresia Congenital absence of the normal valvular opening from the left ventricle of the heart into the aorta…
- External ear There are three sections of the ear. They are the external ear, the middle ear, and the inner ear. The…