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).
Aortic valve, bicuspid
Whereas the normal aortic valve in the heart has three flaps (cusps) that open and close, a bicuspid valve has only two. There may be no symptoms in childhood, but in time the valve may become stenotic (narrowed), making it harder for…
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Show more- ACS (American Cancer Society) A 'nationwide community-based voluntary health organization dedicated to eliminating cancer as a major health…
- Cancer, breast, susceptibility genes Cancer, breast, susceptibility genes: Inherited factors that predispose to breast cancer. Put otherwise…
- Noncoding DNA The strand of DNA that does not carry the information necessary to make proteins. DNA normally has two…
- UL 1. Upper lid (of the eye). 2. Upper limit. No evidence was found for chronic excess intakes of potassium in…
- Q.d. (on prescription) Seen on a prescription, q.d. (or qd) means one a day (from the Latin quaque die). The abbreviation is…
- Vein, external jugular The more superficial of the two jugular veins situated on each side of the neck. The other is the internal…
- Bow-legs A condition in which the legs curve out to leave a gap between the knees after the period of infancy has…
- Cecum The cecum (also spelled caecum), the first portion of the large bowel, situated in the lower right quadrant…
- Catechol-O-methyltransferase COMT. An enzyme that catalyzes the degradation of catecholamines, including the neurotransmitters dopamine…
- Power-of-attorney for health-care decision-making See: Proxy. health care.
- Triiodothyronine A hormone made by the thyroid gland. It has three iodine molecules attached to its molecular structure. It is…
- FLT-3 inhibitor A gene-targeted therapy for a common subtype of acute myeloid leukemia (AML) known as FLT-positive AML in…