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For the Yorkshire village, see Crackpot, North Yorkshire.

Pejoratively, the term Crackpot is used against a person, subjectively also called a crank, who writes or speaks in an authoritative fashion about a particular subject, often in science, but is alleged to have false or even ludicrous beliefs.

Someone addicted to crack (i.e. a drug addict) also known as a "crackhead."

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Crank (person)