Electrocardiogram (noun)

1. A graphical record of the electrical activity of the heart.
2. A test which records the electrical activity of the heart using electrodes attached to the skin.
3. A diagnostic tool that is used to detect heart problems.

Origin:

From the greek words "electron" meaning "amber" (referring to the fact that early electrocardiograms used amber plates), "cardia" meaning "heart" and the suffix "-gram" meaning "to write". it entered the english language in the 20th century.

Examples:

1. The patient underwent an electrocardiogram to check for any heart problems.
2. The electrocardiogram showed an abnormal rhythm in the patient's heart.
3. An electrocardiogram is used to detect heart problems such as arrhythmia.
4. The electrocardiogram was used to check the patient's heart function before surgery.
5. The electrocardiogram was used to detect any electrical disturbances in the heart.