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).
Melena
Stools or vomit stained black by blood pigment or dark blood products.
Read the definitionRandom terms
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- Empirical Based on experience and observation, rather than systematic logic. Experienced physicians often use empirical…
- Abse, Dannie British pulmonary physician and poet. Abse was born in 1923 in Cardiff, Wales to a Jewish family. He studied…
- Syndrome, Cogan A form of arteritis (also referred to as vasculitis) that involves the ear. This condition is called Cogan…
- Lung cancer, oat cell See: Oat cell cancer
- Bulbar conjunctiva That part of the conjunctiva, a clear membrane of the eye, which covers the outer surface of the eye. The…
- Kilobase Unit of length of DNA equal to 1000 nucleotide bases
- Fear of bees An abnormal and persistent fear of bees. A phobia can cause avoidance and panic. Phobias are a relatively…
- Corneal dystrophy A condition in which one or more parts of the cornea lose their normal clarity due to a buildup of cloudy…
- Therapy, external beam radiation Radiation focused from a source outside the body on the affected area (for example, the cancer) within the…
- NHGRI Stands for National Human Genome Research Institute, one of the National Institutes of Health (NIH) in the…
- United States Pharmacopeia Abbreviated USP. A publication, established in 1820, that contains legally recognized standards of identity…