Definition of plaque
1a : an ornamental brooch; especially : the badge of an honorary orderb : a flat thin piece (as of metal) used for decorationc : a commemorative or identifying inscribed tablet
2a : a localized abnormal patch on a body part or surfaceb : a sticky usually colorless film on teeth that is formed by and harbors bacteriac : an atherosclerotic lesiond : a histopathologic lesion of brain tissue that is characteristic of Alzheimer's disease and consists of a dense proteinaceous core composed primarily of beta-amyloid that is often surrounded and infiltrated by a cluster of degenerating axons and dendrites
3 : a clear area in a bacterial culture produced by viral destruction of cells
Examples of plaque in a Sentence
A bronze plaque marked the city's oldest building.
They gave him a plaque in honor of his 30 years of service.
Brushing your teeth prevents the buildup of plaque.
The scientists are studying the way the plaques form.
Recent Examples of plaque from the Web
Since its creation in 1993, there have been 278 plaques installed.
A photo on Princeton’s history department website shows Wang posing under a plaque at the entrance of China’s official Xinhua News Agency bureau in Kabul, Afghanistan.
The monument and plaque were originally dedicated on Flag Day 1921 on land donated by former CA DAR State Regent Mary Stilson.
Today, a memorial plaque to Ninemire stands beside the Walmart.
Plaques above the bar detailed how to dress footlongs in order to create an authentic dog from Chicago or New York and other famous combinations.
This plaque was created to commemorate the mezuzah project the congregation had in March and features the names of the donors who made the event possible.
A mezuzah plaque was unveiled and the progress made by the lesbian, gay, bisexual and transgender community was celebrated during a recent Pride Shabbat service at Congregation Etz Chaim in Wilton Manors.
The plaque will be on display at Globe Life Park on Aug. 11-12.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'plaque.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of plaque
French, from Middle French, metal sheet, from plaquer to plate, from Middle Dutch placken to piece, patch; akin to Middle Dutch placke piece, Middle High German placke patch
First Known Use: 1845See Words from the same year
PLAQUE Defined for English Language Learners
Definition of plaque for English Language Learners
: a flat, thin piece of metal or wood with writing on it that is used especially as a reminder of something (such as a historic event or an achievement)
: a thin coating that forms on teeth and contains bacteria
medical : a change in brain tissue that occurs in Alzheimer's disease
PLAQUE Defined for Kids
Definition of plaque for Students
1 : a flat thin piece (as of metal) with writing on it that serves as a memorial of something
2 : a sticky usually colorless thin film on the teeth that is formed by and contains bacteria
Medical Definition of plaque
1a: a localized abnormal patch on a body part or surface and especially on the skin psoriatic plaqueb: a sticky usually colorless film on teeth that is formed by and harbors bacteriac: an atherosclerotic lesiond: a histopathologic lesion of brain tissue that is characteristic of Alzheimer's disease and consists of a dense proteinaceous core composed primarily of beta-amyloid that is often surrounded and infiltrated by a cluster of degenerating axons and dendrites—called also senile plaque
2: a visibly distinct and especially a clear or opaque area in a bacterial culture produced by damage to or destruction of cells by a virus
Seen and Heard
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