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slate noun

  /sleɪt/
  • (uncountable, geology) A fine-grained homogeneous sedimentary rock composed of clay or volcanic ash which has been metamorphosed so that it cleaves easily into thin layers.
  • (uncountable) The bluish-grey colour of most slate.
  • (countable) A chalkboard, sheet of slate for writing on with chalk or with a thin rod of slate (a slate pencil) formerly commonly used by both students and teachers in schools.
  • (countable) A roofing-tile made of slate.
  • (countable) A record of money owed.
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