micron

noun

mi·​cron ˈmī-ˌkrän How to pronounce micron (audio)

Examples of micron in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Strands of Pele's hair are extremely thin—typically around one micron across—but can grow up to a couple of feet in length. Yaakov Katz, Newsweek, 17 Jan. 2025 In theory, such filters are supposed to remove at least 99.97% of the particles that are 0.3 microns (µm) in size from the air. Bruce Y. Lee, Forbes, 10 Jan. 2025 Fine particulate matter—also known as PM2.5 or, more familiarly, soot—refers to particles that are less than 2.5 microns in diameter, and is produced by internal combustion engines, forest fires, and other sources. Alex Hutchinson, Outside Online, 9 Jan. 2025 Smoke contains microscopic particles known as PM 2.5 because the PM (particulate matter) measures 2.5 microns or less—small enough to easily wiggle its way into our lungs and then into our bloodstreams. Kylie Mohr, WIRED, 4 Jan. 2025 See all Example Sentences for micron 

Word History

Etymology

New Latin, from Greek mikron, neuter of mikros small — more at micr-

First Known Use

1879, in the meaning defined above

Time Traveler
The first known use of micron was in 1879

Dictionary Entries Near micron

Cite this Entry

“Micron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/micron. Accessed 1 Feb. 2025.

Kids Definition

micron

noun
mi·​cron ˈmī-ˌkrän How to pronounce micron (audio)

Medical Definition

micron

noun
mi·​cron ˈmī-ˌkrän How to pronounce micron (audio)
: a unit of length equal to one millionth of a meter

called also micrometer, mu

More from Merriam-Webster on micron

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