electrocardiogram

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.

Structure: electro (electricity) + cardio (heart) + gram (something written or recorded) - 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."