atheroma

In pathology, an atheroma (plural: atheromata) is an accumulation and swelling (-oma) in artery walls that is made up of cells, or cell debris, that contain lipids (cholesterol and fatty acids), calcium and a variable amount of fibrous connective tissue. In the context of heart or artery matters, atheromata are commonly referred to as atheromatous plaques. It is an unhealthy condition, but is found in most humans.
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Atheroma /ath·er·o·ma/ a mass or plaque of degenerated thickened arterial intima, occurring in atherosclerosis. ath·er·o·ma n. pl. [more]Atheroma - Community and Resources

Noun
1. a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow
(hypernym) adipose tissue, fat, fatty tissue

(n.)
An encysted tumor containing curdy matter.
  

(n.)
A disease characterized by thickening and fatty degeneration of the inner coat of the arteries.
  

noun
thickening of the walls of an artery by deposits of a fatty substance such as cholesterol