What does cardiology mean?
Cardiology is the branch of medicine devoted to the heart and the circulatory system, encompassing the diagnosis and treatment of conditions such as coronary artery disease, heart failure, arrhythmias, and congenital heart defects. The word derives from the Greek kardia, meaning heart, combined with -logy, meaning study. Physicians who practice cardiology are known as cardiologists, and the field includes subspecialties such as interventional cardiology, which uses catheter-based procedures to treat blocked arteries, and pediatric cardiology, which addresses heart conditions in children. In everyday usage, cardiology appears most often in medical and institutional contexts — hospital departments, medical school curricula, and news coverage of health care. The term carries a formal, clinical register; in casual conversation people typically refer to seeing a 'heart doctor' instead. As a mass noun it takes singular agreement and has no ordinary plural form.
nounThe branch of medicine that deals with the structure, function, and diseases of the heart and blood vessels.
- The branch of medicine concerned with the heart and blood vessels, their functions, disorders, and treatment.
"After the abnormal results, her doctor referred her to a specialist in cardiology."
"She trained for over a decade before specializing in interventional cardiology."
"The hospital's new cardiology unit opened last spring, doubling its capacity for cardiac patients."
A plural form is theoretically possible but essentially never used; the word is treated strictly as uncountable.
"Modern cardiology has transformed the treatment of heart disease."
Every beat of your heart — around 100,000 a day — falls under the gaze of cardiology, a field whose very name means 'the study of the heart' in Greek.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cardiology
Cardiology entered English from French cardiologie, itself built on New Latin roots combining the Greek kardia ('heart') with -logia ('study of'). Such -ology formations became widespread in European scientific vocabulary during the early modern period as scholars systematized branches of knowledge. Its cognates share the same Greek root: cardiac, cardiogram, and myocardium all descend from kardia, making this root one of the most productive in medical terminology.
Related word forms
How cardiology is actually used
Cardiology is a formal, technical term used mainly in medical, academic, and professional contexts; everyday speakers are more likely to say 'heart doctor' than 'cardiologist'. It is an uncountable noun and takes singular agreement. The related adjective 'cardiological' exists but is rare outside scholarly writing.
Easily confused with cardiology
Hematology is the study of blood and blood disorders, whereas cardiology is the study of the heart and circulatory system.