- a narrative dealing with a murder or a series of murders and the detection of the criminal; detective story.
Also especially British, who·dun·nit.
Origin of whodunit
1925–30; jocular formation from question Who done it?, for standard English Who did it?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for whodunit
A traditional forensic investigation begins with a classic question: Whodunit?America's Anti-Poaching Private Eyes
September 5, 2014
Just what that is—and whodunit—remains the overarching plot that carries an electric current throughout the action.‘Broadchurch’: This British Murder Mystery Will Be Your Next Television Obsession
April 22, 2013
Word Origin and History for whodunit
"murder mystery," 1930, U.S. slang, originally a semi-facetious formation from who done it?
Online Etymology Dictionary, © 2010 Douglas Harper