Search Result for "brain-teaser": 
Wordnet 3.0

NOUN (1)

1. a difficult problem;
[syn: riddle, conundrum, enigma, brain-teaser]



The Collaborative International Dictionary of English v.0.48:

brain-teaser \brain-teaser\ n.
   a difficult problem.

   Syn: riddle, conundrum, enigma.
        [WordNet 1.5]


WordNet (r) 3.0 (2006):

brain-teaser
    n 1: a difficult problem [syn: riddle, conundrum, enigma,
         brain-teaser]