| brain-teaser or brain-twister | |
| —n | |
| informal a difficult problem | |
| brain-twister or brain-twister | |
| —n | |
| a fool or simpleton; ninny. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
brain-twister definitionand brain-teaser
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