plaque

noun
\ ˈplak \

Definition of plaque 

1a : an ornamental brooch especially : the badge of an honorary order

b : a flat thin piece (as of metal) used for decoration

c : a commemorative or identifying inscribed tablet

2a : a localized abnormal patch on a body part or surface

b : a sticky usually colorless film on teeth that is formed by and harbors bacteria

c : an atherosclerotic lesion

d : 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.
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Recent Examples on the Web

Researchers have dated the plaque to the Roman times, likely before before the 3rd century AD, the Greek culture ministry said on Tuesday. Laignee Barron, Time, "Archaeologists Find What Could be the Oldest Written Record of Homer's 'Odyssey'," 11 July 2018 Trees and benches, with dedicatory plaques, are the most common donations that appear in parks, at beaches, on trails and along streets. Hillary Davis, latimes.com, "Newport Beach City Council considers increasing fees for fire inspections," 11 July 2018 The crowns of the title — there are five — look like antique versions of astronaut headgear: gilded copper helmets, each studded with gems, encrusted with repoussé plaques, and topped by five-pronged antennas — the vajra or thunderbolt of wisdom. New York Times, "The Art of Staying Cool: 10 Can’t-Miss Summer Shows in New York," 4 July 2018 For decades the graves went unacknowledged: no markers, no plaques, no memorials. Matías Costa, Smithsonian, "The Battle Over the Memory of the Spanish Civil War," 28 June 2018 Mice infected with these herpes viruses quickly accumulate beta amyloid plaques, too. Melinda Wenner Moyer, Scientific American, "Harder Evidence Builds that Viruses Play a Role in Alzheimer’s," 21 June 2018 The city will place a memorial plaque in place of the guns, at the suggestion of a VFW Post in Ballard, Shulkin said. Christine Clarridge, The Seattle Times, "Seattle war memorial to lose battle guns, drawing criticism even as city cites safety, costs," 18 June 2018 According to a plaque, the bridge was constructed by A.M. Kennedy and Sons in 1878 and originally stood over the Flat Rock River, south of Milroy, Ind. Cain Buchmeier, Post-Tribune, "Milroy Bridge dedication postponed after new graffiti discovered," 13 June 2018 Earlier this year, a couple was charged with pilfering a memorial to victims at Stoneman Douglas, taking teddy bears, plaques, pinwheels and other tokens of remembrance. Skyler Swisher, Sun-Sentinel.com, "Profiting from pain: 'Murderabilia' has macabre appeal to collectors," 13 June 2018

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.

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First Known Use of plaque

1845, in the meaning defined at sense 1a

History and Etymology for 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

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Dictionary Entries near plaque

plan view

planxty

plappart

plaque

plaquette

plash

plashingly

Statistics for plaque

Last Updated

1 Sep 2018

Look-up Popularity

Time Traveler for plaque

The first known use of plaque was in 1845

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More Definitions for plaque

plaque

noun

English Language Learners Definition of plaque

: 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

noun
\ ˈplak \

Kids Definition of plaque

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

plaque

noun
variants: also placque \ˈplak \

Medical Definition of plaque 

1a : a localized abnormal patch on a body part or surface and especially on the skin psoriatic plaque

b : a sticky usually colorless film on teeth that is formed by and harbors bacteria

c : an atherosclerotic lesion

d : 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

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