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

Lillian Allison, the other woman listed on the church plaque, died at her Maine home in 1999, at age 86. Tommy Rowan, Philly.com, "Plaque honoring 'Men who served in World War II' includes two women," 24 May 2018 The Texas Historical Commission plaque and the granite block and concrete base commemorating the Battle of Adams Hill that was on Montgomery Road off of Highway 90 on the way to Castroville near Blue Skies of Texas is missing. Paul Allen, San Antonio Express-News, "Missing historical marker wasn’t stolen or destroyed; officials say it’s in storage and will be relocated," 21 Apr. 2018 Inside, the museum has a new flexible area where about 20 of its 65 vehicles can spread out, along with informative plaques on the history and significance of each truck or engine. Mark Yost, WSJ, "A Museum to Spark New Interest," 11 July 2018 More than 60 donors have joined the Leaders Giving Back Campaign and will be recognized with plaques on site. Staff Report, Post-Tribune, "Community news," 6 June 2018 The poem was engraved on a clay plaque found in the ancient Greek city of Olympia, a sanctuary on the Peloponnese peninsula and the original site of the Olympic Games, Reuters reports. Laignee Barron, Time, "Archaeologists Find What Could be the Oldest Written Record of Homer's 'Odyssey'," 11 July 2018 This included work on one of his proudest accomplishments, having his name engraved on a plaque that is now on MARS! courant.com, "Lawrence A. Paul," 8 July 2018 To commemorate the landmark outing a plaque is permanently affixed to the South wall of Court No. Sandra Harwitt, USA TODAY, "USA's John Isner hopes to break third-round curse at Wimbledon," 5 July 2018 During the ceremony Sunday, Michigan state Sen. Margaret O'Brien gave Spencer a plaque from the state thanking him for his service. CBS News, "Last survivor of World War II unit fulfills its whiskey pact," 3 July 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

10 Nov 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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