noun 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.
noun 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.
noun A small card representing an amount of money, used for betting in casinos; a sort of gaming chip.
noun A clearing in a bacterial lawn caused by a virus.
noun In the Hornbostel–Sachs classification system: any flat, thin musical instrument.
blown plaques
noun A broad patch of abnormal tissue distinguishable from surrounding tissue, especially a broad papule (“inflamed, irritated patch”) on the skin.
noun An abnormal accumulation of material in or on an organ of the body, often associated with disease.
amyloid plaque
noun An accumulation in artery walls made up of macrophage cells and debris containing lipids, (cholesterol and fatty acids), calcium, and connective tissue; an atheroma.