chalk has definitions from the fields of color,geology,medicine,pharmacology
1
[ noun ] (color) a pure flat white with little reflectance

Related terms

white

2
[ noun ] (geology) a soft whitish calcite

Related terms

calcite calcium_carbonate

3
[ verb ] write, draw, or trace with chalk

Related terms

draw trace

4
[ noun ] (medicine,pharmacology) amphetamine used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
5
[ noun ] Last name, frequency rank in the U.S. is 12083
6
[ noun ] a piece of chalk (or similar substance) used for writing on blackboards or other surfaces
*