plaque /plɑːk, plæk $ plæk/ BrE AmE noun
[ Date: 1800-1900 ; Language: French ; Origin: Dutch plak , from plakken 'to stick' ]
1 . [countable] 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)
2 . [uncountable] a harmful substance which forms on your teeth, which ↑ bacteria can live and breed in