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Noun: brain-teaser
  1. A difficult problem
    - riddle, conundrum, enigma

Derived forms: brain-teasers

Type of: problem

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brainish
brainless
brainpan
brainpower
brains trust
brainsick
brainstem
brain-stem
brainstorm
brainstorming
brain-teaser
brainwash
brainwashed
brainwashing
brainwave
brainworker
brain-worker
brainy
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braised
braising