culprit

[ kuhl-prit ]
/ ˈkʌl prɪt /

noun

a person or other agent guilty of or responsible for an offense or fault.
a person arraigned for an offense.

Origin of culprit

1670–80; traditionally explained as cul (representing Latin culpābilis guilty) + prit (representing Anglo-French prest ready), marking the prosecution as ready to prove the defendant's guilt. See culpable, presto
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British Dictionary definitions for culprit

culprit
/ (ˈkʌlprɪt) /

noun

law a person awaiting trial, esp one who has pleaded not guilty
the person responsible for a particular offence, misdeed, etc

Word Origin for culprit

C17: from Anglo-French cul-, short for culpable guilty + prit ready, indicating that the prosecution was ready to prove the guilt of the one charged
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012