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brainteaser

[breyn-tee-zer]
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noun
  1. a puzzle or problem whose solution requires great ingenuity.
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Origin of brainteaser

First recorded in 1920–25; brain + tease + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for brain-teaser

riddle, mystery, enigma, puzzlement, poser, mystification, problem, why, brain-teaser

British Dictionary definitions for brain-teaser

brain-teaser

brain-twister

noun
  1. informal a difficult problem
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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