Dictionary definition · chalk
noun
- a soft whitish calcite
- a pure flat white with little reflectance
- 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
- 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
verb
- write, draw, or trace with chalk
Source: Open English WordNet (CC BY 4.0).