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 chalk chalk /ˈtʃɔk/

noun

  1. A piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces  ( chalk )
    a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces
     Can you please pass me the chalk so that I can write on the blackboard?
    Can you please pass me the chalk so that I can write on the blackboard?
  2. [Informal] An amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant  ( chalk [Informal] , chicken feed , crank [Informal] , deoxyephedrine , glass [Informal] , ice [Informal] , meth [Informal] , methamphetamine , methamphetamine hydrochloride , Methedrine , shabu [Informal, Asia] , trash [Informal] , crystal meth , gak [Informal] )
    an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
  3. A pure flat white with little reflectance  ( chalk )
    a pure flat white with little reflectance
  4. A soft whitish calcite  ( chalk )
    a soft whitish calcite
     The teacher used a piece of chalk to write the day's lesson on the blackboard.
    The teacher used a piece of chalk to write the day's lesson on the blackboard.

verb

  1. Write, draw, or trace with chalk  ( chalk )
    write, draw, or trace with chalk