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What does plaque mean?

Looking for the meaning or definition of the word plaque? Here's what it means.

Noun
  1. Any flat, thin piece of metal, clay, ivory, or the like, used for ornament, or for painting pictures upon, as a slab, plate, dish, or the like, hung upon a wall; also, a smaller decoration worn on the person, as a brooch.
  2. A piece of flat metal with a writing on it, attached to a building to remind people of a person or an event.
  3. Any flat, thin musical instrument.
  4. (uncountable) An accumulation of biofilm, or bacteria on teeth.
  5. (medicine) Atheroma, an accumulation in artery walls made up of macrophage cells and debris containing lipids, (cholesterol and fatty acids), calcium, and connective tissue.
  6. (biology) A clearing in a bacterial lawn caused by a virus.
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