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).
Blighted ovum
A fertilized ovum (egg) that did not develop or whose development ceased at an early stage, before 6 or 7 weeks of gestation. On the ultrasound examination of a blighted ovum, only the gestational sac that normally surrounds the embryo can…
Read the definitionRandom terms
Show more- PSC (primary sclerosing cholangitis) See: Primary sclerosing cholangitis
- Sunscreen A substance that blocks the effect of the sun's harmful rays. Using lotions that contain sunscreens can…
- Breast cancer gene One of the genes that contributes to breast cancer. See also: BRCA breast cancer gene
- Placebo response A positive medical response to taking a placebo, a sham medication as if it were an active medication. Up to…
- Ricker syndrome A disease of infants and children that disturbs normal bone formation (ossification). Rickets is a failure to…
- Cystic hernia See: Cystocele
- Quater in die (on prescription) Seen on a prescription, qid (or q.i.d.) means 4 times a day (from the Latin quater in die). The abbreviation…
- Myocyte A muscle cell. From myo-, muscle + -cyte, cell = muscle cell. 'Remaining young at heart is a desirable but…
- Chargaff ratios See: Chargaff rule
- Recreational water illness An illness that is spread by swallowing, breathing, or having contact with contaminated water from swimming…
- Bone, frontal See: Frontal bone
- Sight, day Night blindness. Listed in medical dictionaries under 'Nyctalopia' from the Greek 'nyct' (night) + 'aloas'…