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
Andrew Paul, Popular Science, 11 June 2026
Aerosolized particles can range from a few nanometers to several tens of micrometers, which could make a quick squirt of deodorant or hairspray a catastrophic event.
—Victor Tangermann, Futurism, 10 June 2026
Embedded throughout these materials are microscopic magnetic particles roughly 5 micrometers in size.
—New Atlas, 8 June 2026
So the Zurich robotics team engineered microscopic machines about six micrometers wide – smaller than a red blood cell.
—Will Barker, TheWeek, 4 June 2026
See All Example Sentences for micrometer
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Noun
Previous research shows speeds reaching 120 micrometers a second.
—Andrew Paul, Popular Science, 11 June 2026
Aerosolized particles can range from a few nanometers to several tens of micrometers, which could make a quick squirt of deodorant or hairspray a catastrophic event.
—Victor Tangermann, Futurism, 10 June 2026
Embedded throughout these materials are microscopic magnetic particles roughly 5 micrometers in size.
—New Atlas, 8 June 2026
So the Zurich robotics team engineered microscopic machines about six micrometers wide – smaller than a red blood cell.
—Will Barker, TheWeek, 4 June 2026
See All Example Sentences for micrometer
Cite this Entry
“Micrometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/micrometer. Accessed 18 Jun. 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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