myocardial infarction (Monarch Disease Ontology entry MONDO_0005068) is gross necrosis of the myocardium, as a result of interruption of the blood supply to the area, as in coronary thrombosis. Also known as: MI, MI, myocardial infarction, heart attack, infarction (MI), myocardial, myocardial infarct, myocardial infarction (disease), myocardial infarction, (MI).