Plaque is sticky white stuff on your teeth in which bacteria live, a wood or metal object that is often used to commemorate or memorialize.
(noun)See plaque in Webster's New World College Dictionary
noun
Origin: Fr < MDu placke, disk, spot, patch
See plaque in American Heritage Dictionary 4
noun
Origin:
Origin: French
Origin: , from Old French, metal plate
Origin: , perhaps from Middle Dutch placke, disk, patch
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