Plaque

Plaque or placque may refer to:


 * Commemorative plaque, a flat ornamental plate or tablet fixed to a wall, used to mark a significant event, person, etc.
 * Plaquette, a small decorative plaque in metal, ceramics, or other materials
 * Memorial Plaque, issued to next-of-kin of dead British military personnel after World War I
 * Plaque, a rectangular casino token

In biology

 * Amyloid plaque
 * Atheromatous plaque, a buildup of white blood cell (sometimes termed fatty, despite absence of adipocytes) deposits within the wall of an artery
 * Dental plaque, a biofilm that builds up on teeth
 * Mucoid plaque, a supposed thick coating of abnormal mucous material in the colon
 * Plaque (dermatology), a broad papule
 * Pleural plaque, often caused by exposure to asbestos
 * Senile plaque, an extracellular protein buildup implicated in various diseases such as Alzheimer's disease and Parkinson's disease
 * Viral plaque, a visible structure formed by virus propagation within a cell culture