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
Neetika Walter, Interesting Engineering, 29 Jan. 2026
But the commercially-available 400 x 400-micrometer unit inside the MIT design is bioresorbable, with a zinc-cellulose antenna that humans can digest.
—New Atlas, 28 Jan. 2026
Each has been thinned down to tens of micrometers and is shot through with vertical connections.
—IEEE Spectrum, 14 Jan. 2026
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
Penn State researchers addressed this by making their hydrogels extremely thin, only 20 micrometers per layer, allowing more power generation without external supports.
—Neetika Walter, Interesting Engineering, 29 Jan. 2026
But the commercially-available 400 x 400-micrometer unit inside the MIT design is bioresorbable, with a zinc-cellulose antenna that humans can digest.
—New Atlas, 28 Jan. 2026
Each has been thinned down to tens of micrometers and is shot through with vertical connections.
—IEEE Spectrum, 14 Jan. 2026
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 5 Feb. 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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