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Prefix · anatomy · heart

cardio-

Means "heart": cardiogram, cardiology, cardiovascular, cardiac, cardiomyopathy.

In Spanish: cardio-Scientific

Written by Bryan López, English teacher · Updated July 2026

Heart, circulatory system

Cardio- comes from Greek "kardia" (heart) and appears primarily in medical vocabulary. Cardiogram = graphic record of the heart; cardiology = the study of the heart; cardiovascular = of the heart and blood vessels; cardiac = relating to the heart; cardiopulmonary = of the heart and lungs. Spanish uses the identical prefix: cardiograma, cardiología, cardiovascular, cardíaco.

From the gym to medicine

Cardio- has a double life: in everyday language, "doing cardio" means aerobic exercise that strengthens the heart; in medicine, cardiology is the specialty dedicated to the heart, and cardiovascular disease is the leading cause of death worldwide. Knowing this prefix is essential for health and medical vocabulary in English.

How it is used

Combines mainly with Greek and Latin roots in medical contexts:

  • cardio- + study/measurement
    gram → cardiogramlogy → cardiologygraph → cardiographlogist → cardiologist
  • cardio- + body system
    vascular → cardiovascularpulmonary → cardiopulmonarythoracic → cardiothoracicmyopathy → cardiomyopathy

Pronunciation: /ˈkɑːr.di.oʊ/. Spanish uses the identical prefix: cardiograma (cardiogram), cardiología (cardiology), cardiovascular, cardíaco (cardiac), cardiomiopatía (cardiomyopathy).

How it is pronounced

cardio-/ˈkɑːr.di.oʊ/

Tap the button to hear how the prefix sounds. Each word in the table has its own audio.

Examples

Root word
With cardio-
In a phrase
  • gramcardiogramThe doctor reviewed her cardiogram and found no irregularities.
  • logycardiologyShe specialised in cardiology after completing her medical residency abroad.
  • vascularcardiovascularRegular exercise significantly reduces the risk of cardiovascular disease.
  • accardiacHe suffered a cardiac arrest but recovered fully after surgery.
  • pulmonarycardiopulmonaryCPR is a cardiopulmonary resuscitation technique that can save lives.
  • myopathycardiomyopathyCardiomyopathy weakens the heart muscle and impairs its ability to pump.
  • thoraciccardiothoracicA cardiothoracic surgeon operates on the heart, lungs, and chest wall.

Common mistakes

using "cardiogram" and "ECG" as if they are completely different things
ECG (electrocardiogram) is the most common type of cardiogram — cardiogram is the broader term for any graphic record of heart activity

"Cardiogram" (cardio- = heart + Greek "gramma" = written record): any graphic recording of cardiac activity. An ECG or EKG (electrocardiogram) is the specific type that records electrical activity, and is the most common in clinical use. In everyday speech, "cardiogram" and "ECG/EKG" are often used interchangeably.

A trick to remember it

Cardio- = heart. Spanish uses the identical prefix in all forms: cardiograma, cardiología, cardiovascular, cardíaco. In everyday English, "doing cardio" = aerobic heart-strengthening exercise.

Practise what you learned

Exercise 1 · Form the word

Regular exercise significantly reduces the risk of ___ disease, the leading cause of death worldwide.

Hint: cardio- + vascular (blood vessels) = ?

Exercise 2 · Pick the right one

What does cardiology study?

Frequently asked questions

What does the prefix cardio- mean in English?

The prefix cardio- means "heart": cardiogram, cardiology, cardiovascular, cardiac, cardiomyopathy. In Spanish it usually maps to cardio-.

How do you pronounce cardio-?

The prefix cardio- is pronounced /ˈkɑːr.di.oʊ/. For example, "cardiogram".

Can you give an example of a word with cardio-?

"gram" becomes "cardiogram". It is a typical example of the cardio- prefix.

Other useful prefixes

  • bio-

    Signals relation to life or biological processes: biology, biography, biodiversity, biofuel.

  • neuro-

    Signals relation to the nervous system: neuron, neuroscience, neurotransmitter, neuroplasticity.

  • psycho-

    Signals relation to the mind or psychology: psychology, psychotherapy, psychoanalysis.

Learn every English prefix

un-, re-, pre-, dis-, over-, in-... every beginning you need to unlock thousands of English words at once.

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