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- Interleukins Substances used in biological therapy. Interleukins stimulate the growth and activities of certain kinds of…
- Yeast vaginitis Yeast vaginitis: Infection of the vagina by a fungus known as Candida, characteristically causing itching…
- ADA deficiency Lack of normal adenosine deaminase (ADA) activity, a genetic (inherited) condition causing one form of severe…
- Cancer, lymphoma, Hodgkin (adult) A type of lymphoma (cancer of the lymphatic system). The most common symptom of Hodgkin disease is a painless…
- Actinomycetes A group of gram-positive bacteria (order Actinomycetales) that produce various bioactive agents including…
- Syndrome, Horner A complex of abnormal findings, namely sinking in of one eyeball, ipsilateral ptosis (drooping of the upper…
- Ablation, endometrial Removal of the lining of the womb. Removing the uterine lining decreases menstrual flow or stops it…
- Medical directives, advance Advance directives preserve the person's right to accept or reject a course of medical treatment even after…
- Rhinitis, allergic, seasonal Allergic rhinitis (hayfever) which occurs during a specific season
- Childhood ataxia with CNS hypomyelinization Ataxia with central nervous system hypomyelinization: An inherited brain disease that occurs mainly in…
- Myxoma A benign tumor composed of primitive connective tissue. The plural is myxomas or myxomata
- Analytic sensitivity The lowest level of a substance that can be detected by an analytic method