English

Definition of monkey puzzle noun from the Oxford Advanced Learner's Dictionary

 

monkey puzzle

 noun
noun
BrE
 
; NAmE
 
(also monkey puzzle tree)
 
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a conifer tree with leaves like scales, that are thin, tough and very sharp Word Origin mid 19th cent.: said to be so named in response to a remark that an attempt to climb the tree would puzzle a monkey.
See the Oxford Advanced American Dictionary entry: monkey puzzle