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).
Adrenal medulla
The inner portion of adrenal gland. (The outer portion is the adrenal cortex). The adrenal medulla makes epinephrine (adrenaline) and norepinephrine (noradrenaline). Epinephrine is secreted in response to low blood levels of glucose as…
Read the definitionRandom terms
Show more- Founder effect The positive effect on gene frequency when a population (a colony) has only a small number of original…
- Minipill A form of oral contraceptive taken daily, like combined oral contraceptives (the 'pill'), but containing only…
- Operation, Macewen A surgical operation for inguinal hernia designed by Sir William Macewen (1848-1924), a surgeon in Glascow…
- Encephalomyelitis Inflammation of both the brain and the spinal cord. Encephalomyelitis can be caused by a variety of…
- Nursing home A residential facility for persons with chronic illness or disability, particularly older people who have…
- Fear of water An abnormal and persistent fear of water. Sufferers of aquaphobia experience anxiety even though they realize…
- Functional magnetic resonance imaging The use of magnetic resonance imaging (MRI) to learn which regions of the brain are active in a specific…
- Counseling, genetic An educational counseling process for individuals and families who have a genetic disease or who are at risk…
- Randomization A method based on chance alone by which study participants are assigned to a treatment group. Randomization…
- Rupture of appendix A break or tear in the appendix, usually due to appendicitis. Also called perforation of the appendix…
- Arthroscopy Arthroscopy: A surgical technique whereby a tube-like instrument is inserted into a joint to inspect…
- Orientation, anatomic terms of See Anatomic terms of orientation