Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

atheroma
     n : a fatty deposit in the intima (inner lining) of an artery;
         can obstruct blood flow
     [also: {atheromata} (pl)]