A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
A shining area on the frons of many species of Tabanomorpha (horse flies and relatives).
The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece.
The new formation over the end of a cutting, before it puts out rootlets.
To form such hardened tissue.
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).
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 soft, white, powdery limestone (calcium carbonate, CaCO3).
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.