electrocardiogram
Meaning
A medical test that measures and records the electrical activity of the heart.
Structure
Usage
The doctor ordered an electrocardiogram to check for any irregular heart rhythms.
A routine electrocardiogram can be a vital tool in early detection of heart disease.
The technician carefully analyzed the peaks and valleys on the patient's electrocardiogram.
Etymology
The word 'electrocardiogram' is a modern scientific compound built from three Greek-derived morphemes. 'Electro-' originates from 'ēlektron,' the Greek word for amber, a substance known for its static electric properties. 'Cardio-' derives from 'kardia,' the ancient Greek term for the heart, the central organ of the circulatory system. Finally, '-gram' comes from 'gramma,' meaning a written mark or record. Thus, the term's literal construction—"a written record of the heart's electricity"—perfectly describes the medical procedure where electrodes on the skin capture and graph the heart's electrical impulses.
Analysis
- electro: From Greek 'ēlektron' (amber, associated with electricity). A combining form meaning "electric" or "electrical." - cardio: From Greek 'kardia' (heart). A combining form meaning "of or relating to the heart." - gram: From Greek 'gramma' (something written, a letter). A combining form meaning "a record or picture produced by an instrument."