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
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
Microplastics are small plastic particles that range in size from 1 micrometer to 5 millimeters.
—Ambuj Tewari, The Conversation, 6 Mar. 2025
Most isopods are incredibly small, some as tiny as micrometers, while others can grow larger than 3 feet, according to the National Oceanic & Atmospheric Administration.
—Eric Lagatta, USA TODAY, 23 Jan. 2025
See All Example Sentences for micrometer
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Noun
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
Microplastics are small plastic particles that range in size from 1 micrometer to 5 millimeters.
—Ambuj Tewari, The Conversation, 6 Mar. 2025
Most isopods are incredibly small, some as tiny as micrometers, while others can grow larger than 3 feet, according to the National Oceanic & Atmospheric Administration.
—Eric Lagatta, USA TODAY, 23 Jan. 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 11 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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