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
Tanya Wildt, Freep.com, 5 July 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, 4 June 2025
Shark Inspiration for Materials The research team applied pressure to microscopic pieces of the shark’s vertebrae and found deformations, smaller than one micrometer.
—Discover Magazine, 20 May 2025
The sites hawk their wares with scientific specificity: microprinting in dots per inch, card thickness in micrometers (polycarbonate stock for that stiff, authentic feel) and various types of laminates.
—Kaja Andric, New York Times, 13 Feb. 2025
See All Example Sentences for micrometer
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Noun
Particles that are less than 10 micrometers and 2.5 micrometers in diameter are called PM10 and PM2.5, respectively.
—Tanya Wildt, Freep.com, 5 July 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, 4 June 2025
Shark Inspiration for Materials The research team applied pressure to microscopic pieces of the shark’s vertebrae and found deformations, smaller than one micrometer.
—Discover Magazine, 20 May 2025
The sites hawk their wares with scientific specificity: microprinting in dots per inch, card thickness in micrometers (polycarbonate stock for that stiff, authentic feel) and various types of laminates.
—Kaja Andric, New York Times, 13 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 12 Jul. 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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