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).
Syndrome, trisomy 21
A common chromosome disorder, often called Down syndrome, due to an extra chromosome number 21 (trisomy 21). The chromosome abnormality affects both the physical and intellectual development of the individual. Trisome 21 (Down) syndrome is…
Read the definitionRandom terms
Show more- Capillaries Capillaries are the smallest of blood vessels. They serve to distribute oxygenated blood from arteries to the…
- Peak-flow meter This hand-held device measures air flow (how fast air is blown out of the lungs). Patients can use peak-flow…
- Affective disorder, seasonal (SAD) Depression that tends to occur (and recur) as the days grow shorter in the fall and winter. It is believed…
- Roundworm A type of parasitic worm that hatches in the intestines and lives there. The eggs of the roundworm usually…
- Motoneuron The term motoneuron is an elision of motor and neuron. See: Motor neuron
- Disease, Forestier A severe form of hemorrhagic fever which affects both humans and non-human primates. Caused by a genetically…
- Randomization A method based on chance alone by which study participants are assigned to a treatment group. Randomization…
- Syndrome, Shprintzen See: Velocardiofacial syndrome
- Female genitalia The genital organs of the female. These are usually separated by convention into the external and internal…
- Proctology A medical specialty that deals with disorders of the rectum and anus
- Progestational hormone A synonym for the hormone progesterone. See: Progesterone
- Liver cancer, adult primary A tumor in which the cancer starts during adulthood in cells in the liver. Also called hepatocellular…