electrocardiogram Syllabification: (e·lec·tro·car·di·o·gram)Pronunciation: /iˌlektrōˈkärdēəˌgram/ (abbreviation: ECG or EKG)Translate electrocardiogram | into German Definition of electrocardiogram noun Medicine a record or display of a person’s heartbeat produced by electrocardiography. electrocardiogram in other Oxford dictionaries Definition of electrocardiogram in the British & World English dictionary