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.
- 100% free
- No registration
- No intrusive ads
- Privacy by design
- Mobile friendly
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).
Day sight
Night blindness. Listed in medical dictionaries under 'Nyctalopia' from the Greek 'nyct' (night) + 'aloas' (obscure or blind) + 'opsis' (vision), the condition involves impaired vision in dim light and in the dark (but normal sight in…
Read the definitionRandom terms
Show more- Swallowing syncope The temporary loss of consciousness upon swallowing. Syncope is the temporary loss of consciousness or, in…
- Transcription factor A protein that controls when genes are switched on or off -- whether genes are transcribed or not…
- Lentiginosis profusa syndrome See: LEOPARD syndrome
- Syndrome, Li-Fraumeni (LFS) This is an extraordinary cancer family syndrome. People with LFS have a tendency to develop a great diversity…
- Medium-chain acyl-CoA dehydrogenase An enzyme abbreviated as MCAD. See: MCAD deficiency
- Blood pH The acidity or alkalinity of blood. The pH of any fluid is the measure of the hydrogen ion (H-)…
- Sperm A sperm is the male 'gamete' or sex cell. It combines with the female 'gamete,' called an ovum, to form a…
- Alpha blocker A drug that blocks receptors in arteries and smooth muscle. This action relaxes the blood vessels and leads…
- Interventricular foramen An opening between the lateral and third ventricles in a system of four communicating cavities within the…
- X-ray crystallography The use of X-rays of known wavelength to learn the structure of any crystalline material. Put otherwise…
- Bacterial prostatitis, chronic Prostatitis, chronic: Longstanding bacterial infection of the prostate gland superimposed on a defect in the…
- Peptide A molecule consisting of 2 or more amino acids. Peptides are smaller than proteins, which are also chains of…