placard

/ˈplæk.ɑːd/

placard · noun — A sheet of paper or cardboard with a written or printed announcement on one side for display in a public place.

Definition from Wiktionary (CC BY-SA 3.0).

placard is pronounced /ˈplæk.ɑːd/.

Etymology

From Middle English placard (“official document”), from Middle French placard, placart, plaquart (“a placard, a writing pasted on a wall”), from the Old French verb plaquer, plaquier (“to stick or paste, roughcast”), from Middle Dutch placken, plecken (“to glue or fasten, plaster, patch”), ultimately from Proto-Germanic *plaggą (“a piece of cloth, patch”), equivalent to plaque + -ard. Related to Middle Low German placken (“to smear with lime or clay, plaster”), Saterland Frisian Plak, Plakke (“a hit, smack, slap”), German Placken (“a spot, patch”), Icelandic plagg (“a document”), Hebrew פלקט (plakat, “a large sheet of paper, typically with a photo or writing, posted on the wall”), English play. Compare also Modern Dutch plakkaat (“placard”), Saterland Frisian Plakoat (“a placard, poster”).

noun

A sheet of paper or cardboard with a written or printed announcement on one side for display in a public place.
A public proclamation; a manifesto or edict issued by authority.e.g.“All placards or edicts are published in his name.” — 1655, James Howell, “A Survey of the Seventeen Provinces”, in Epistolæ Ho-Elianæ. Familiar Letters Domestic and Forren. […], 3rd edition, volume (please specify the page), London: […] Humphrey Mos[e]l
Permission given by authority; a license.e.g.“to give a placard to do something”
An extra plate on the lower part of the breastplate or backplate of armour.
A kind of stomacher, often adorned with jewels, worn in the fifteenth century and later.
The woodwork and frame of the door of a closet etc.

verb

To affix a placard to, or mark with a placard nearby.e.g.“The inner walls of the church were placarded with large mural tablets of copper, bearing engraved inscriptions celebrating the merits of old Heilbronn worthies of two or three centuries ago, […]” — 1880, Mark Twain [pseudonym] (Samuel L[anghorne] Clemens), chapter XII, in A Tramp Abroad; […], Hartford, Conn.: American Publishing Company; London: Chatto & Windus, →OCLC, page 108:
To announce with placards.e.g.“to placard a sale”

Definitions & examples from Wiktionary (CC BY-SA 3.0).