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).
Fear of the dark
Pathological fear of the dark, an abnormal and persistent dread of the dark. Sufferers experience undue anxiety even though they may rationally realize that the dark does not pose a threat commensurate with their fear. Fear of the dark is…
Read the definitionRandom terms
Show more- Amplification Making multiple copies of a gene or of any sequence of DNA. Repeated copying of a piece of DNA. In…
- Melanoma, iris See: Intraocular melanoma
- Congenital clasped thumb with mental retardation See: Clasped thumbs and mental retardation
- Fibroids Fibroids are common, benign tumors of smooth muscle in the uterus (womb). Uterine fibroids are the most…
- Purpura 1. A hemorrhagic area in the skin. The area of bleeding within the skin, by definition, is greater than 3…
- SEM Scanning electron microscope
- Nipple shield A cap or dome, usually made today of plastic (formerly, rubber), placed over the nipple and areola during…
- Vaccination, German measles See Immunization, MMR.
- Deficiency, vitamin K A lack of vitamin K resulting in an increase in the clotting time of the blood, impaired clotting and a…
- Neuroradiologist A radiologist who specializes in the use of radioactive substances, x-rays and scanning devices for the…
- Data Facts, statistics, and the like. In medicine and the health sciences, people often speak of 'the data'…
- Labor, false Intermittent non-productive muscular contractions of the womb (uterus) during pregnancy, most commonly in the…