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).
Mutation, null
A mutation (a change) in a gene that leads to its not being transcribed into RNA and/or translated into a functional protein product. For example, a null mutation in a gene that usually encodes a specific enzyme leads to the production of…
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Show more- Kubler-Ross, Elizabeth See: Kubler-Ross, Elisabeth
- NREM sleep Sleep: NREM (non-rapid eye movement) sleep is dreamless sleep. During NREM, the brain waves on the…
- Biofeedback A method of treatment that uses monitors to feed back to patients physiological information of which they are…
- Beta-secretase An enzyme that appears to be directly involved in the early development of Alzheimer's disease…
- Lymph node The first lymph node ("gland") to receive lymphatic drainage from a tumor. Which lymph node is the sentinel…
- Ventricular arrhythmias Abnormal rapid heart rhythms (arrhythmias) that originate in the lower chambers of the heart (the…
- Syndrome, economy class The formation of blood clots in veins deep within the legs -- deep vein thrombosis -- occurring during (or…
- Spina bifida occulta A bony defect in the vertebral column that causes a cleft in that column. The cleft remains covered by skin…
- Journal of the American Medical Association A medical journal sponsored by the National Cancer Institute (NCI), one of the National Institutes of Health…
- McClintock, Barbara (1902-1992) American geneticist who won the 1983 Nobel Prize in Physiology or Medicine for her discovery of…
- Tumor registry Recorded information about the status of patients with tumors. Although a registry was originally the place…
- Death 1. The end of life. The cessation of life. (These common definitions of death ultimately depend upon the…