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chalk noun

  /t͡ʃɑk/ , /t͡ʃɔk/ , /t͡ʃɔːk/
  • (uncountable) A soft, white, powdery limestone (calcium carbonate, CaCO3).
creta, gesso
  • (countable) A piece of chalk, or nowadays processed compressed gypsum (calcium sulfate, CaSO4), that is used for drawing and for writing on a blackboard (chalkboard).
gessetto, gesso
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