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).
Deficiency, lactase
Not enough of an enzyme called lactase in the small intestine to digest lactose, a prominent component of milk and most other dairy products. Lactose is sometimes also used as an ingredient in other foods, so anyone with lactase deficiency…
Read the definitionRandom terms
Show more- Virulence The ability of any agent of infection to produce disease. The virulence of a microorganism (such as a…
- Ophthalmitis Inflammation of the eye. Also known as ophthalmia
- Medicaid State programs of public assistance to persons regardless of age whose income and resources are insufficient…
- Jejunum Part of the small intestine. It is half-way down the small intestine between its duodenum and ileum sections…
- Quarantine The period of isolation decreed to control the spread of infectious disease. Before the era of antibiotics…
- Immunization, Td Td is the vaccine given to children over six and adults as boosters for immunity to diphtheria and tetanus
- OMS (World Health Organization) In medicine, the person who is ready to respond, the one on duty. As in "Who is the doctor on call this…
- Amnesia, anterograde See: Antegrade amnesia
- Dyscalculia A specific developmental disability affecting a person's ability to conceptualize and perform mathematics…
- MPO deficiency Myeloperoxidase deficiency
- Tache noire Black spot (in French), a small ulcer covered with a black crust at the site of a tick bite, characteristic…
- Ophthalmoplegia-plus syndrome See: Kearns-Sayre syndrome