DictionaryRoot: placquard
Old French
placquard
official document with a large, flat seal
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noun / verb
placard
PLAK-ard/ˈplækɑːrd/
A sign displayed in public, or to display such signs.
Etymology
Placquard named an official document bearing a large, flat seal. The meaning shifted from an authenticated document to a proclamation or announcement posted publicly to attract attention.