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
Shannon Tyler, Idaho Statesman, 22 Aug. 2025
At micrometers across — 10,000 times larger than individual atoms — Dynabeads are vastly more easily controlled and observed.
—Patchen Barss, Quanta Magazine, 18 Aug. 2025
The researchers first created a single cell unit using submillimeter-sized photovoltaic chips that measure 885 by 685 micrometers, with an active area of 585 by 585 µm.
—IEEE Spectrum, 6 Aug. 2025
According to Yale Medicine, the particles can be 10 micrometers, PM 10, or as small as 2.5 micrometers, PM 2.5, and the smaller one poses a lot of health risks.
—Julia Gomez, USA Today, 5 Aug. 2025
See All Example Sentences for micrometer
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Noun
According to, IQAir, Boise’s air has particulate matter measuring 2.5 micrometers in diameter or less.
—Shannon Tyler, Idaho Statesman, 22 Aug. 2025
At micrometers across — 10,000 times larger than individual atoms — Dynabeads are vastly more easily controlled and observed.
—Patchen Barss, Quanta Magazine, 18 Aug. 2025
The researchers first created a single cell unit using submillimeter-sized photovoltaic chips that measure 885 by 685 micrometers, with an active area of 585 by 585 µm.
—IEEE Spectrum, 6 Aug. 2025
According to Yale Medicine, the particles can be 10 micrometers, PM 10, or as small as 2.5 micrometers, PM 2.5, and the smaller one poses a lot of health risks.
—Julia Gomez, USA Today, 5 Aug. 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 26 Aug. 2025.
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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