brain-teaser
Noun
Synonyms:
riddle
conundrum
enigma
WordNet 3.0
Noun
(1)
a difficult problem
Synonyms:
riddle
conundrum
enigma
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Webster's Dictionary (GCIDE)
brain-teaser
\brain-teaser\
n. a difficult problem.
Syn:
riddle, conundrum, enigma.
[WordNet 1.5]
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