Meaning of plaque

plaque

Pronunciation: (plak), [key]
— n.
  1. a thin, flat plate or tablet of metal, porcelain, etc., intended for ornament, as on a wall, or set in a piece of furniture.
  2. an inscribed commemorative tablet, usually of metal placed on a building, monument, or the like.
  3. a platelike brooch or ornament, esp. one worn as the badge of an honorary order.
  4. a flat, often raised, patch on the skin or other organ, as on the inner lining of arterial walls in atherosclerosis.
  5. a soft, sticky, whitish matlike film attached to tooth surfaces, formed largely by the growth of bacteria that colonize the teeth.
  6. a cleared region in a bacterial culture, resulting from lysis of bacteria by bacteriophages.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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