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).
Heterochromatin, facultative
Heterochromatin that need not always be heterochromatic but which has the faculty to return to the normal euchromatic state. The inactive X chromosome is made up of facultative heterochromatin. When a woman transmits that X to a son, it…
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Show more- Hookworm An intestinal parasite that usually causes diarrhea or cramps. Heavy infestation with hookworm can be serious…
- Periodic abstinence Also known as fertility awareness, natural family planning, and the rhythm method, this approach entails not…
- Cardiac myocyte A heart muscle cell. Sometimes called a myocyte when it is understood that it is in the heart. See also…
- Brachytherapy, coronary artery A slow heart rate, usually defined as less than 60 beats per minute. The word bradycardia is logically…
- Cancer, larynx Cancer of the voice box (the larynx) which is located at the top of the windpipe (trachea). Also called…
- Slipped vertebra See: Spondylolisthesis
- Thrombophlebitis Inflammation of a vein that occurs when a blood clot forms
- Parietal lobe Part of the brain, specifically the section of the cerebral hemisphere that lies beneath the parietal bone…
- Salk Institute The Salk Institute for Biological Studies , a prominent independent non-profit institution doing basic…
- Hyperadrenocorticism Excess hormone called 'cortisol'. Often called Cushing's syndrome, it is an extremely complex condition that…
- Menetrier disease See: Giant hypertrophic gastritis
- Tocus Labor, childbirth. Directly from the Greek 'tokos' meaning childbirth