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).
Yolk sac
Not all yolk has to do with birds' eggs. Human embryos have a yolk sac, too. The human yolk sac is a membrane outside the embryo that is connected by a tube (the yolk stalk) though the umbilical opening to the embryo's midgut. The yolk sac…
Read the definitionRandom terms
Show more- Disease, Alzheimer See: Alzheimer disease
- Nerve conduction velocity test Nerve conduction velocity test> An electrical test used to detect nerve conditions. In the nerve conduction…
- Contraceptive, minipill A form of oral contraceptive taken daily, like combined oral contraceptives (the 'pill'), but containing only…
- Cancer, prostatic Cancer of the gland (prostate) that produces some of the components of semen fluid. The second leading cause…
- Pachyonychia congenita of the Jadassohn-Lewandowsk E: This is a type of pachyonychia congenita (elephant nails from birth). The characteristic features include…
- Idiot savant See: Autistic savant. The term 'autistic savant' is preferred to the old term 'idiot savant' as less…
- Breslow thickness A method for determining the prognosis with melanoma. The thickness of a melanoma is related to the 5-year…
- Innervate To supply with nerves. It is a little known fact that the cornea is the most densely innervated tissue in the…
- Immunization, polio One of the two polio vaccines that are available: oral polio vaccine (OPV) and inactivated polio vaccine…
- Cerebral vascular See: Cerebrovascular
- Helminthology, medical See: Medical helminthology
- Hoarseness Hoarseness: Hoarseness is a term referring to abnormal voice changes. Hoarseness may be manifested as a voice…