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chalk

noun [C or U]
 
 
/tʃɔːk/ US  /tʃɑːk/

Definition

a type of soft white rock, or (a stick of) this rock or a similar substance used for writing or drawingTypes 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 from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of chalk