an extremely dangerous medical condition in which the flow of blood to the heart is blocked by a blood clot (= a mass of blood)

He's in hospital after having a coronary last week. 上星期他因冠状动脉血栓住进了医院。

relating to the arteries (= thick tubes) that supply blood to the muscles of the heart

Regular exercise reduces the risk of coronary heart disease. 经常锻炼身体能减少患冠心病的危险。