The word that is being looked for in this problem would probably be and most likely be the word plaque.
Coronary artery disease is a disease of the heart where the arteries and blood vessels become clogged with fat deposits called plaque. Plaque is usually described a fatty deposits that clog the arteries which then results to a coronary artery disease, well actually it isn't just fats at all. It is a combination of other stuffs such as calcium, scar tissues, and proteins, all together with the fats that make up the plaque.