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).
RNA interference
Abbreviated RNAi. The introduction of double-stranded RNA into a cell to inhibit the expression of a gene. Also known as RNA silencing, inhibitory RNA, and RNA inactivation. See also: RNA inactivation
Read the definitionRandom terms
Show more- Prostate specific antigen Prostate specific antigen: Widely known as PSA. See: PSA.
- Dilated cardiomyopathy A disorder in which the chambers of the heart are dilated (enlarged) because the heart muscle is weakened and…
- XXY See: Klinefelter syndrome
- Syndrome, post-polio (PPS) A constellation of symptoms and signs that appear from 20 to 40 years after the initial polio infection, and…
- Ear wax Ear wax: A natural wax-like substance secreted by special glands in the skin on the outer part of the ear…
- Care, preoperative See: Preoperative care
- Dyslexia Dyslexia: A specific reading disability due to a defect in the brain's processing of graphic symbols…
- Foot-and-mouth disease A disease caused by a highly infectious virus that can infect people but affects them most by infecting…
- Myxedema, infantile Hypothyroidism (subnormal activity of the thyroid gland) that starts after birth and is manifest by features…
- Kiddie-cam See: Kiddie cam
- Prion A disease-causing agent that is neither bacterial nor fungal nor viral and contains no genetic material. A…
- Muscular dystrophy, distal One of two genetic muscle diseases characterized by wasting of the muscles most distant from the midline…