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atheroma (n.)

"encysted tumor," 1706, medical Latin, from Greek atheroma, from athere "groats, porridge" (related to ather "chaff"), in reference to the matter inside; a word of unknown origin. For ending, see -oma. Related: Athermatous (1670s).

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Definitions of atheroma from WordNet

atheroma (n.)
a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow;
From wordnet.princeton.edu