plaque

noun \ ˈplak \

Definition of plaque

1 a :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
2 a :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

  1. A bronze plaque marked the city's oldest building.

  2. They gave him a plaque in honor of his 30 years of service.

  3. Brushing your teeth prevents the buildup of plaque.

  4. The scientists are studying the way the plaques form.

Recent Examples of plaque from the Web

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

Other Dentistry Terms


PLAQUE Defined for English Language Learners

plaque

noun

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

plaque

noun \ ˈplak \

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 Dictionary

plaque

noun
variants: also placque play \ˈplak\

medical Definition of plaque

1 a :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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