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

Definition of micron

Examples of micron in a Sentence

Recent Examples on the Web In mid-September, the ventilation system will be turned on to start to filter the air until the room is much cleaner than an operating room, aiming for a standard of a single micron-sized particle per cubic foot. Evan Ramstad, Star Tribune, "Minnesota chipmaker SkyWater finishes addition construction, equipment going in sooner than planned," 8 Sep. 2020 But at one micron, the particle size that experts say is relevant to transmission, Marr observed that the two gaiters were both able to stop at least 50 percent of the droplets. Allyson Chiu, Washington Post, "‘A lot of variables’: New research into popular gaiters highlights challenges of testing mask safety," 25 Aug. 2020 Though the coronavirus itself usually measures about a tenth of a micron, virus-containing particles in the air are much bigger, mostly between 1 and 10 microns. Alexandra Ossola, Quartz, "You don’t need fancy air filter systems to reduce Covid-19 risk," 18 Aug. 2020 That opening led into a particle-sizing instrument that could detect tiny solids from 20 microns down to half a micron. Megan Molteni, Wired, "A New Study Suggests a Possible Disease Vector: Germy Dust," 19 Aug. 2020 The hollow fiber membrane filter removes bacteria, protozoa, and particulate matter larger than 0.1 micron and can treat up to 100,000 gallons. Adrienne Donica, Popular Mechanics, "One of Our Top Rated Backpacking Water Filters Is Only $25 Right Now," 11 Aug. 2020 The outer layer was full of micron-sized holes that open at the same temperature. Theresa Machemer, Smithsonian Magazine, "This Robotic Hand Stays Cool by Sweating," 31 Jan. 2020 These pores typically measure 0.2 micron for filters and 0.01 micron for purifiers. Adrienne Donica, Popular Mechanics, "The Best Backpacking Water Filters, Tested," 23 July 2020 These consist of water, mucus protein and other biological material and are all larger than 1 micron. Eric Litke, USA TODAY, "Fact check: No, N95 filters are not too large to stop COVID-19 particles," 12 June 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'micron.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of micron

1879, in the meaning defined above

History and Etymology for micron

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

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Time Traveler for micron

Time Traveler

The first known use of micron was in 1879

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Statistics for micron

Last Updated

16 Sep 2020

Cite this Entry

“Micron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/micron. Accessed 27 Sep. 2020.

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More Definitions for micron


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

Medical Definition of micron

: a unit of length equal to one millionth of a meter

called also micrometer, mu

More from Merriam-Webster on micron

Nglish: Translation of micron for Spanish Speakers

Britannica.com: Encyclopedia article about micron

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