chalk Meaning and Definition

1. n. 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

2. n. 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. n. a pure flat white with little reflectance

4. n. a soft whitish calcite

5. v. write, draw, or trace with chalk