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millimeter
noun
mil·li·me·ter
ˈmi-lə-ˌmē-tər
variants
US millimeter
or British millimetre
: a unit of length equal to ¹/₁₀₀₀ meter see Metric System Table
Examples of millimeter in a Sentence
Recent Examples on the Web
Blue light penetrates one millimeter to reduce inflammation and bacteria, and helps your body clock.
—Beth Landman, The Hollywood Reporter, 4 Dec. 2024
Blood pressure is measured by two numbers, expressed in millimeters of mercury (mm Hg): the systolic (upper or first) number and the diastolic (lower or second) number.
—Corey Whelan, Verywell Health, 1 Dec. 2024
The city is sinking at a rate of 1-2 millimeters a year.
—Lea Lane, Forbes, 30 Oct. 2024
Chiva, just east of Valencia, received 320 millimeters (12.6 inches) of rain in just over four hours, according to the European Severe Weather Database.
—CNN, 30 Oct. 2024
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Word History
Etymology
French millimètre, from milli- + mètre meter
First Known Use
1797, in the meaning defined above
Dictionary Entries Near millimeter
Cite this Entry
“Millimeter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/millimeter. Accessed 11 Dec. 2024.
Kids Definition
millimeter
noun
mil·li·me·ter
ˈmil-ə-ˌmēt-ər
: a measure of length equal to ¹⁄₁₀₀₀ meter see metric system table
Medical Definition
millimeter
noun
mil·li·me·ter
variants
or chiefly British millimetre
: one thousandth of a meter
—abbreviation mm
More from Merriam-Webster on millimeter
Nglish: Translation of millimeter for Spanish Speakers
Britannica English: Translation of millimeter for Arabic Speakers
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