chalk
Plural
chalks
1
a white or colored stick similar to chalk that is used for drawing or writing
Chalk is a soft, white or colored substance made from calcium carbonate, commonly used for writing or drawing on surfaces like blackboards or sidewalks. It comes in stick form and can be easily erased or washed away, making it ideal for temporary markings.
2
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
a pure flat white with little reflectance
4
a soft whitish calcite
5
a group of soft, white rock layers made mainly from the remains of tiny sea animals, often found in hills, cliffs, or underground
- The cliffs are made of thick chalk deposits.
- Geologists studied the chalk layers in the hill.
- Fossils were found deep in the chalk.
- The chalk in this area formed millions of years ago.
- Rain slowly wears down the chalk over time.