Illustration of micrometer
- micrometer 2
mi·crom·e·ter
mī-ˈkrä-mə-tər 
1
: an instrument used with a telescope or microscope for measuring minute distances
2
: a caliper for making precise measurements that has a spindle moved by a finely threaded screw
mi·cro·me·ter
ˈmī-krō-ˌmē-tər
: a unit of length equal to one millionth of a meter
called also micron
see Metric System TableExamples of micrometer in a Sentence
Recent Examples on the Web
IEEE Spectrum, 27 Dec. 2025
The system’s capabilities were demonstrated by imaging a bullet cartridge, capturing micrometer-scale details such as the firing pin impression.
—Neetika Walter, Interesting Engineering, 23 Dec. 2025
However, until now, these materials could only be made up to about 200 micrometers thick, limited by how molecules move through the material during formation.
—Pranjal Malewar, New Atlas, 22 Nov. 2025
The worsening air quality is driven by excessive PM2.5, fine particulate matter up to 2.5 micrometers in diameter, which can often come from sources like power plants, industrial processes, vehicle emissions, woodstoves, and wildfires.
—Amanda Greenwood, MSNBC Newsweek, 18 Nov. 2025
See All Example Sentences for micrometer
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Noun
Nvidia and Broadcom recently deployed optical transceivers that live inside the same package as a processor, separating the electronics and optics by micrometers rather than centimeters or meters.
—IEEE Spectrum, 27 Dec. 2025
The system’s capabilities were demonstrated by imaging a bullet cartridge, capturing micrometer-scale details such as the firing pin impression.
—Neetika Walter, Interesting Engineering, 23 Dec. 2025
However, until now, these materials could only be made up to about 200 micrometers thick, limited by how molecules move through the material during formation.
—Pranjal Malewar, New Atlas, 22 Nov. 2025
The worsening air quality is driven by excessive PM2.5, fine particulate matter up to 2.5 micrometers in diameter, which can often come from sources like power plants, industrial processes, vehicle emissions, woodstoves, and wildfires.
—Amanda Greenwood, MSNBC Newsweek, 18 Nov. 2025
See All Example Sentences for micrometer
Cite this Entry
“Micrometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/micrometer. Accessed 3 Jan. 2026.
Copy CitationKids Definition
micrometer
1 of 2 noun
mi·crom·e·ter
mī-ˈkräm-ət-ər
1
: an instrument used with a telescope or microscope for measuring very small distances
micrometry
noun
-ˈkräm-ə-trē
micrometer
2 of 2 noun
mi·cro·me·ter
ˈmī-krō-ˌmēt-ər
: a unit of length equal to one millionth of a meter
Medical Definition
micrometer
1 of 2 noun
mi·crom·e·ter
mī-ˈkräm-ət-ər
: an instrument used with a telescope or microscope for measuring minute distances
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