Relating to, containing, or affected by atheromas (fatty arterial deposits).
Adjective form of 'atheroma' using the standard '-ous' ending. This descriptive form developed as physicians needed ways to describe tissue and plaques that contained atherosclerotic material.
When a doctor looks at an artery under a microscope and sees it's full of fatty sludge, they call it 'atheromatous'—the adjective lets them describe what the tissue actually looks like!
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