Dybbuk definitions

dĭb'o͝ok, dē-bo͝ok'
In Jewish folklore, the wandering soul of a dead person that enters the body of a living person and controls his or her behavior.
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The spirit of a dead person that enters the body of a living person and possesses it.
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A malicious possessing spirit, believed to be the dislocated soul of a dead person.
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Origin of dybbuk

Yiddish dibek from Hebrew dibbūq probably from dābaq to cling dbq in Semitic roots