A soft, white, powdery limestone (calcium carbonate, CaCO3).
A platoon-sized group of airborne soldiers.
The favorite in a sporting event.
The prediction that there will be no upsets, and the favored competitor will win.
A piece of chalk, or nowadays processed compressed gypsum (calcium sulfate, CaSO4), that is used for drawing and for writing on a blackboard (chalkboard).
Tailor's chalk.
A white powdery substance used to prevent hands slipping from holds when climbing, or losing grip in weight-lifting or gymnastics, sometimes but not always limestone-chalk, often magnesium carbonate (MgCO3).
To manure (land) with chalk.
To make white, as if with chalk; to make pale; to bleach.
To record something, as on a blackboard, using chalk.
To apply chalk to anything, such as the tip of a billiard cue.
To use powdered chalk to mark the lines on a playing field.
To record a score or event, as if on a chalkboard.
Calcium hydroxide, a soft white powder, produced by adding water to quicklime. It is used in making mortar and cement, and has many industrial uses.