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.
- 100% free
- No registration
- No intrusive ads
- Privacy by design
- Mobile friendly
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).
Fraction, ejection
The portion of blood that is pumped out of a filled ventricle as a result of a heartbeat. The heart does not eject all of the blood that is in the ventricle. Normally, about two-thirds of the blood is pumped out with each beat. That…
Read the definitionRandom terms
Show more- Radical neck dissection A surgical procedure involving the removal of a tumor from the neck with an additional margin of normal…
- Blurred vision Lack of sharpness of vision with, as a result, the inability to see fine detail. Blurred vision can occur…
- Tarantismo A neurological syndrome characterized by repetitive, involuntary, purposeless movements caused by the…
- Kawasaki disease Kawasaki disease: A disease that has nothing to do with the motor bike of the same name but is a syndrome of…
- Vaccine, Sabin polio See: Polio vaccine, oral
- Asthma, miner's See: Black lung disease
- Pregnancy, pernicious vomiting of Medically known as hyperemesis gravidarum, this is excessive vomiting in early pregnancy. By definition…
- Internist A physician who specializes in the diagnosis and medical treatment of adults. This specialty, called internal…
- Scarlet fever Also called scarlatina, a disease caused by infection with group A streptococcal bacteria that occurs in a…
- Extremophile An organism that lives under extreme conditions. An example of an extremophile is Methanococcus jannaschii, a…
- Onychomycosis, proximal white subungual The rarest form of fungus infection of the finger or toenail. (Fungus infection of the finger or toenail is…
- Compassionate use Term used in the US for a method of providing experimental therapeutics prior to final FDA approval for use…