n. 1 an ornamental tablet of metal, porcelain, etc., esp. affixed to a building in commemoration. 2 a deposit on teeth where bacteria proliferate. 3 Med. a a patch or eruption of skin etc. as a result of damage. b a fibrous lesion in atherosclerosis. 4 a small badge of rank in an honorary order. plaquette n.
[ F f. Du. plak tablet f. plakken stick ]