MedicalVocabulary.org
Medical vocabulary with 16,436 clear, complete and reliable definitions.
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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).
Petechiae
Pinpoint flat round red spots under the skin surface caused by intradermal hemorrhage (bleeding into the skin). Petechiae are red because they contain red blood that has leaked from the capillaries into the skin. Petechiae are quite tiny…
Read the definitionRandom terms
Show more- Macular (skin) Adjective referring to macules which are circumscribed changes in the color of skin that are neither raised…
- Social psychology The study of the mind and mental processes, particularly as regards social interactions, focusing on the ways…
- Node, sinoatrial The sinoatrial is one of the major elements in the cardiac conduction system, the system that controls the…
- Renal transplant Replacement of a diseased, damaged, or missing kidney with a donor kidney. Also called a kidney transplant…
- RPR test Rapid plasma reagin, a blood test for syphilis that looks for an antibody that is present in the bloodstream…
- Endocannabinoid A marijuana-like substance. 'Marijuana-like substances (endocannabinoids)... act at specific receptors on the…
- White matter The part of the brain that contains myelinated nerve fibers. The white matter is white because it is the…
- Slipped spine See: Spondylolisthesis
- Radical prostatectomy A surgery procedure that removes the entire prostate gland plus some surrounding tissue. During the procedure…
- Protein requirements, infant Proteins contain different amino acids that are linked together. Proteins provide both calories and the amino…
- Lipoidosis, sphingomyelin Also called Niemann-Pick disease, this is a disorder of the metabolism of a lipid (fat) called sphingomyelin…
- Patient-controlled analgesia See: PCA