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).
Sleep, rapid eye movement
Sleep, rapid eye movement: REM sleep is the portion of sleep when there are rapid eye movements (REMs). Dreams occur during REM sleep. We typically have 3 to 5 periods of REM sleep per night. They occur at intervals of 1-2 hours and are…
Read the definitionRandom terms
Show more- Segment, genomic A region of the genome; it encompasses objects described as loci or probes. Genomic segments can range in…
- Genetic immunodeficiency disease See: Primary immunodeficiency disease
- Snuff Tobacco in the form of a powder that is inhaled into the nose, not smoked. Snuff and chewing tobacco are the…
- Germ cell tumor A tumor that arise from a germ cell. These tumors may arise within the gonads -- the ovary and testis. Most…
- MAP The commonly used term for Mycobacterium avium subspecies paratuberculosis. MAP is an acronym derived from…
- Prognathism An overly prominent jaw.
- Thomas, Lewis (1913-1993) American physician, biologist, and eminent essayist. Thomas graduated from Princeton University…
- Sight, day Night blindness. Listed in medical dictionaries under 'Nyctalopia' from the Greek 'nyct' (night) + 'aloas'…
- Urinary Having to do with the kidneys, ureters, and bladder. The urinary system represents the functional and…
- Atypical Not typical, not usual, not normal, abnormal. Atypical is often used to refer to the appearance of…
- Nerve, eleventh cranial The eleventh cranial nerve is the accessory nerve. The twelve cranial nerves, the accessory nerve included…
- Coloboma A congenital malformation (birth defect) in which part of the eye does not form due to failure of fusion of…