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Synonymous with the common English word "ridiculous." Meaning absurd, preposterous, laughable. This word is commonly used by fans of the best-selling book series, Harry Potter. Riddikulus is the spell used to transform a boggart into something less fear-inducing. Professor R.J. Lupin taught this incantation to Harry Potter and his classmates in Defense Against the Dark Arts during their 3rd year at Hogwarts School of Witchcraft and Wizardry.
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