Plaque \Plaque\, n. [F. Cf. Plack, and see Placard.]

Any flat, thin piece of metal, clay, ivory, or the like, used for ornament, or for painting pictures upon, as a slab, plate, dish, or the like, hung upon a wall; also, a smaller decoration worn on the person, as a brooch.

Source: Webster's Revised Unabridged Dictionary (1913)