“plaque : (countable) Any flat, thin piece of clay, ivory, metal, etc., used for ornament, or for painting pictures upon, as a dish, plate, slab, etc., hung upon a wall; also, a smaller decoration worn by a person, such as a brooch.
(countable) A piece of flat metal with writing on it, attached to a building, monument, or other structure to remind people of a person or an event.
(countable, biology) A clearing in a bacterial lawn caused by a virus.
(countable, music) In the Hornbostel–Sachs classification system: any flat, thin musical instrument.
(countable, pathology) A broad patch of abnormal tissue distinguishable from surrounding tissue, especially a broad papule (“inflamed, irritated patch”) on the skin.
(countable, uncountable, pathology) An abnormal accumulation of material in or on an organ of the body, often associated with disease.
(countable, uncountable, pathology) An accumulation in artery walls made up of macrophage cells and debris containing lipids, (cholesterol and fatty acids), calcium, and connective tissue; an atheroma.
(uncountable, dentistry) An accumulation of biofilm, or bacteria, on teeth.”
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https://en.wiktionary.org/wiki/plaque#English
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