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).
Null mutation
A mutation (a change) in a gene that leads to its not being transcribed into RNA and/or translated into a functional protein product. For example, a null mutation in a gene that usually encodes a specific enzyme leads to the production of…
Read the definitionRandom terms
Show more- Mycobacterium A large family of bacteria that have unusually waxy cell walls that are resistant to digestion. The…
- Agenesis, sacral Failure of formation of all or part of the sacrum (the lowest section of the spine). Currarino syndrome is a…
- Hydatidiform mole A tumor that forms in the uterus as a mass of cysts resembling a bunch of grapes. Moles occur during the…
- Collagen disease A disease (autoimmune or otherwise) that attacks the collagen or other components of connective tissue, such…
- Ophthalmoscopy Examination of the interior of the eye, including the lens, retina and optic nerve, by indirect or direct…
- Bone, sesamoid See Sesamoid bone
- Magnetic resonance spectroscopic imaging (MRSI) A noninvasive imaging method that provides information about cellular activity (metabolic…
- Acustimulation Mild electrical stimulation of acupuncture points done to control symptoms such as nausea and vomiting
- Aesculapius That stick with the snake curled around it is the staff (the rod) of Aesculapius (also called Asklepios), the…
- Subdural hematoma Bleeding into the space between the dura (the brain cover) and the brain itself. This space is called the…
- Random mating Totally haphazard mating with no regard to the genetic makeup (genotype) of the mate so that any sperm has an…
- Pathologist A doctor who identifies diseases by studying cells and tissues under a microscope