plaque Meaning in the Cambridge English Dictionary
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Meaning of “plaque” in the English Dictionary

"plaque" in British English

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uk   /plɑːk/ /plæk/  us   /plæk/

plaque noun (FLAT OBJECT)

[C] a ​flatpiece of ​metal, ​stone, ​wood, or ​plastic with writing on it that is ​attached to a ​wall, ​door, or other ​object: There was a brass plaque ​outside the ​doorlisting the ​variousdentists' ​names. The First ​Lady unveiled a commemorative plaque.
See also
blue plaque UK a plaque on the ​wall of a ​house that ​shows that someone ​famousoncelived there: The ​blue plaque said "Charles Darwin, ​biologist, ​lived here."

plaque noun (SUBSTANCE)

[U] a ​substancecontainingbacteria that ​forms on the ​surface of ​teeth
(Definition of plaque from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"plaque" in American English

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 us   /plæk/

plaque noun (record)

[C] a ​flatobject, often of ​stone or ​metal, with ​text that ​recordsinformation about a ​person, ​place, or ​event: The plaque on the ​buildingpaystribute to the founder's ​generosity.

plaque noun (substance)

[C/U] a ​substance that ​grows on ​yourteeth if you do not ​brush them ​regularly [C/U] Plaque is also a ​substance that may ​grow inside the ​body with ​certaindiseases: About 20 ​companies are ​working on ​treatments for Alzheimer's that would ​interfere with plaque ​formation.
(Definition of plaque from the Cambridge Academic Content Dictionary © Cambridge University Press)
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