n a soft whitish calcite
n a pure flat white with little reflectance
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
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
v write, draw, or trace with chalk
n. 制造白色或彩色粉笔的白垩( chalk的名词复数 )