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English definition of “chalk”

chalk

noun (ROCK)    /tʃɔːk/ US  /tʃɑːk/
[ U] a type of soft white rockTypes of rockPrecious and semi-precious stonesWriting implements chalky     /ˈtʃɔː.ki/ US  /ˈtʃɑː-/ adjective The soil in this area is very chalky (= contains chalk).SoilTypes of rockPrecious and semi-precious stones chalkiness     /ˈtʃɔː.ki.nəs/ US  /ˈtʃɑː-/ noun [U] SoilTypes of rockPrecious and semi-precious stones
(Definition of chalk noun (ROCK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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