atheroma

from WordNet (r) 3.0 (2006)

atheroma
    n 1: a fatty deposit in the intima (inner lining) of an artery;
         can obstruct blood flow

from The Collaborative International Dictionary of English v.0.48

Atheroma \Ath`e*ro"ma\, n. [L., fr. Gr. ?, ?, fr. ? gr?ats,
   meal.] (Med.)
   (a) An encysted tumor containing curdy matter.
   (b) A disease characterized by thickening and fatty
       degeneration of the inner coat of the arteries.
       [1913 Webster]