1
: the head of a pin
2
: something very small or insignificant
3
: a very dull or stupid person : fool
Examples of pinhead in a Sentence
The insect is the size of a pinhead.
Her boss is a real pinhead.
Recent Examples on the Web
Regarding the expressionless eyes, 500 black pins were sourced to find a pinhead the right size, with the team carefully measuring each one.
—
Alex Ritman, Variety, 9 Jan. 2025
Exposure to as little as a pinhead amount of ricin can cause death.
—Fox News, 7 Nov. 2024
To get some scale for the image, their dazzling red caps are just the size of a pinhead.
—New Atlas, 16 July 2024
Below this sieve is a fine-mesh sieve that captures fossil bits down to 0.02 inch in size (smaller than a pinhead).
—Kristi Curry Rogers, Scientific American, 1 Feb. 2024
See All Example Sentences for pinhead
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Alex Ritman, Variety, 9 Jan. 2025
Exposure to as little as a pinhead amount of ricin can cause death.
—Fox News, 7 Nov. 2024
To get some scale for the image, their dazzling red caps are just the size of a pinhead.
—New Atlas, 16 July 2024
Below this sieve is a fine-mesh sieve that captures fossil bits down to 0.02 inch in size (smaller than a pinhead).
—Kristi Curry Rogers, Scientific American, 1 Feb. 2024
See All Example Sentences for pinhead
Cite this Entry
“Pinhead.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pinhead. Accessed 12 Mar. 2025.
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