|Origin:||Dutch plak, from plakken 'to stick'|
a piece of flat metal, wood, or stone with writing on it, used as a prize in a competition or attached to a building to remind people of an event or person:
The team's coach was given a plaque.
commemorative plaque (=a plaque to help people remember something important)
a harmful substance which forms on your teeth, which bacteria can live and breed in