Meaning & use
micrometer
A precision instrument used to measure very small distances or thicknesses.
See it in a sentence
The machinist used a micrometer to check the exact diameter of the bolt.
A good micrometer can detect differences smaller than a hundredth of a millimeter.
A note on using this word
Micrometer can also mean one millionth of a meter, a unit more commonly called a micron.
Words with a similar meaning
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Another way to use it
2. noun
A unit of length equal to one millionth of a meter, also called a micron.
Bacteria are typically measured in micrometers rather than in millimeters or centimeters.
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