Definition of haystack noun from the Oxford Advanced American Dictionary

 

haystack

 noun
noun
NAmE//ˈheɪstæk//
 
 
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  • a large pile of hay, used as a way of storing it until it is needed
  • Idioms
    a needle in a haystack
     
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    a thing that is almost impossible to find Searching for one man in this city is like looking for a needle in a haystack.
    See the Oxford Advanced Learner's Dictionary entry: haystack