Crud or CRUD may refer to:

• Crud (game), a fast-paced game played on a billiards table
• crud, a euphemism for "crap", as a minced oath or in the sense of "dirt"
• CRUD (acronym), Create, Read, Update, and Delete, the basic functions of a database in computing
• Chalk river unidentified deposits, in nuclear engineering a type of radioactive solid which can disturb the process through encouraging the formation of emulsions known often as third phases.

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