Definition of cucumber noun from the Oxford Advanced Learner's Dictionary

 

cucumber

 noun
noun
BrE BrE//ˈkjuːkʌmbə(r)//
 
; NAmE NAmE//ˈkjuːkʌmbər//
 
[countable, uncountable] Vegetables
 
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  • a long vegetable with dark green skin and light green flesh, that is usually eaten raw see also sea cucumber See related entries: Vegetables
  • Word Origin late Middle English: from Old French cocombre, coucombre, from Latin cucumis, cucumer-.Idioms
    (as) cool as a cucumber
     
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    very calm and controlled, especially in a difficult situation
    See the Oxford Advanced American Dictionary entry: cucumber