Meaning

noun (pathology) a small abnormal patch on or inside the body

noun a memorial made of brass

originUnadapted borrowing from French plaque (“plate, sheet (of metal); slab (of marble); bacteria on teeth”), from French plaquer, Middle French plaquer (“to plate”), from Middle Dutch placken (“to patch, beat metal into a thin plate”), from placke (“disk, patch, stain”), from Old Dutch *plagga (“patch”), from Proto-Germanic *plaggą (“patch”). The word is cognate with Middle Low German placke, plagge…

Etymology from Wiktionary, CC BY-SA 3.0