The Simple English Wiktionary has a definition for: crack.

Crack frequently refers to:

• Crack, a fracture or discontinuation in a body
• Crack, in geology, a fracture (geology) in a rock
• Crack, short for crack cocaine, the freebase form of cocaine that can be smoked

Other uses

• Cracking (chemistry), the process whereby complex organic molecules are broken down into simpler molecules

This disambiguation page lists articles associated with the title Crack. If an internal link led you here, you may wish to change the link to point directly to the intended article.