1
: a stack of hay
2
: a vertical standing wave in turbulent river waters
Examples of haystack in a Sentence
Recent Examples on the Web
Researchers from the Australian Wildlife Conservancy (AWC) made this needle-in-haystack find by chance, spotting a large patch of Drosera silvicola just outside of the west coast city of Perth.
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New Atlas, 5 Dec. 2025
However, the gravitational wave detectors were only able to narrow down the source of this signal to a region of sky equivalent to around 6,000 times the width of the moon, which makes looking for an accompanying electromagnetic signal akin to searching for a needle in a cosmic haystack.
—Robert Lea, Space.com, 30 Nov. 2025
According to scientists, detecting such an event in the Large Hadron Collider data is extremely rare and as difficult as finding a single needle in a haystack the size of an Olympic stadium.
—Georgina Jedikovska, Interesting Engineering, 4 Nov. 2025
Each oceanfront room features a balcony looking out toward a towering haystack rock in the sea, plus gas fireplaces, pillow-top mattresses, and cast-iron soaking tubs.
—Molly Allen, Travel + Leisure, 28 Oct. 2025
See All Example Sentences for haystack
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New Atlas, 5 Dec. 2025
However, the gravitational wave detectors were only able to narrow down the source of this signal to a region of sky equivalent to around 6,000 times the width of the moon, which makes looking for an accompanying electromagnetic signal akin to searching for a needle in a cosmic haystack.
—Robert Lea, Space.com, 30 Nov. 2025
According to scientists, detecting such an event in the Large Hadron Collider data is extremely rare and as difficult as finding a single needle in a haystack the size of an Olympic stadium.
—Georgina Jedikovska, Interesting Engineering, 4 Nov. 2025
Each oceanfront room features a balcony looking out toward a towering haystack rock in the sea, plus gas fireplaces, pillow-top mattresses, and cast-iron soaking tubs.
—Molly Allen, Travel + Leisure, 28 Oct. 2025
See All Example Sentences for haystack
Cite this Entry
“Haystack.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/haystack. Accessed 21 Dec. 2025.
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haystack
noun
hay·stack
-ˌstak 
: a stack of hay
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