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
New Atlas, 4 Apr. 2025
The chemical analysis tools used in the study can’t identify particles smaller than 20 micrometers, Mohanty said.
—Kristen Rogers, CNN, 25 Mar. 2025
The average size of microplastics was 82 micrometers, and about 56% of the particles were smaller than 50 micrometers.
—Julia Ries, Health, 1 Apr. 2025
Observing these interactions is extremely challenging, as microbubbles measure only a few micrometers in diameter (a micrometer is a thousandth of a millimeter) and vibrate millions of times per second under ultrasound.
—Jenny Lehmann, Discover Magazine, 26 Feb. 2025
See All Example Sentences for micrometer
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Noun
That's because these flecks are in fact around 10 micrometers wide – or a fifth the width of a human hair.
—New Atlas, 4 Apr. 2025
The chemical analysis tools used in the study can’t identify particles smaller than 20 micrometers, Mohanty said.
—Kristen Rogers, CNN, 25 Mar. 2025
The average size of microplastics was 82 micrometers, and about 56% of the particles were smaller than 50 micrometers.
—Julia Ries, Health, 1 Apr. 2025
Observing these interactions is extremely challenging, as microbubbles measure only a few micrometers in diameter (a micrometer is a thousandth of a millimeter) and vibrate millions of times per second under ultrasound.
—Jenny Lehmann, Discover Magazine, 26 Feb. 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 22 Apr. 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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