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).
Aorta, descending
The descending aorta is the part of the aorta, the largest artery in the body, that runs down through the chest and the abdomen. The descending aorta starts after the arch of the aorta and ends by splitting into two great arteries (the…
Read the definitionRandom terms
Show more- Heterosexual A person sexually attracted to persons of the opposite sex. Or a person who has sexual relations with the…
- Acrocyanosis Blueness of the extremities (the hands and feet). Acrocyanosis is typically symmetrical. It is marked by a…
- Antero- Prefix signifying before, earlier, front. From the Latin anterior meaning before
- Tendo Achilles See: Achilles tendon
- Gram-negative Gram-negative bacteria lose the crystal violet stain (and take the color of the red counterstain) in Gram's…
- Acathisia See: Akathisia
- Oligonucleotide A small DNA molecule composed of a few nucleotide bases. The term 'oligonucleotide' applies similarly to RNA
- UDP-glucuronosyltransferase A liver enzyme essential to the disposal of bilirubin (the chemical that results from the normal breakdown of…
- Leukocoria A white pupillary reflex. When one shines a bright light on the pupil, it normally appears red. In…
- Cascade A sequence of successive activation reactions involving enzymes (enzyme cascade) or hormones (hormone…
- Chest film Most common X-ray used to detect abnormalities in or within the thoracic cage, such as the lungs, heart…
- Tuberculosis vaccination A vaccination for tuberculosis (TB). The vaccine, known as BCG (bacille Calmette Guerin), is used in most…