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).
Myelination
The formation of the myelin sheath around a nerve fiber. Also known as myelinization
Read the definitionRandom terms
Show more- Caudal block See Caudal anesthesia
- Pyelogram X-ray study of the kidney especially showing the pelvis (urine-collecting basin) of the kidney and the ureter.
- Hypertonia Increased tightness of muscle tone. Untreated hypertonia can lead to loss of function and deformity…
- Fibrillation, atrial An abnormal irregular heart rhythm whereby electrical signals are generated chaotically throughout the upper…
- Hereditary ALS See: Familial ALS
- Oxytocin A hormone made in the brain that plays a role in childbirth and lactation by causing muscles to contract in…
- Developmental delay Behind schedule in reaching milestones of early childhood development.
- Melanin A skin pigment (substance that gives the skin its color). Dark-skinned people have more melanin than light-…
- Thyroid gland A gland that makes and stores hormones that help regulate the heart rate, blood pressure, body temperature…
- Mucopolysaccharidosis type VII Sly syndrome, due to deficiency of the enzyme beta-glucuronidase. See also Mucopolysaccharidosis
- Melanoma, lentigo maligna One of the four clinical types of malignant melanoma and the slowest growing one. It typically begins as a…
- Jackson See: Hughlings Jackson, John