Akademik

chalk
1. noun /ʧɑk,ʧɔk,ʧɔːk/
a) A soft, white, powdery limestone.
b) A piece of chalk, or, more often, processed compressed chalk, that is used for drawing and for writing on a blackboard.
2. verb /ʧɑk,ʧɔk,ʧɔːk/
a) To apply chalk to anything, such as the tip of a billiards cue
b) To record something, as on a blackboard, using chalk.
See Also: calcium, calx, chalkboard

Wikipedia foundation.