UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈheɪstæk/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈheɪˌstæk/ ,USA pronunciation: respelling(hāstak′)

WordReference Random House Learner's Dictionary of American English © 2020
hay•stack /ˈheɪˌstæk/USA pronunciation   n. [countable]
  1. Agriculturea stack of hay built up in a field.
  1. a needle in a haystack, something difficult to find:Looking for someone in this mob is like trying to find a needle in a haystack.

WordReference Random House Unabridged Dictionary of American English © 2020
hay•stack  (hāstak′),USA pronunciation n. 
  1. Agriculturea stack of hay with a conical or ridged top, built up in the mowed field so as to prevent the accumulation of moisture and promote drying.
Also,[esp. Brit.,] hayrick. 
  • late Middle English. See hay, stack 1425–75

Collins Concise English Dictionary © HarperCollins Publishers::
haystack /ˈheɪˌstæk/, hayrick /ˈheɪˌrɪk/ n
  1. a large pile of hay, esp one built in the open air and covered with thatch
'haystack' also found in these entries (note: many are not synonyms or translations):
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