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

Example Sentences

Recent Examples on the Web These applications require that more than 99.97 percent of all particles bigger than 0.3 micron [1/100,000 inch] be removed. Discover Magazine, 9 Sep. 2012 The specks of lonsdaleite that Salek and Tomkins’s research group identified were up to a micron in size—still extremely small but roughly 1,000 times larger than any lonsdaleite crystals previously known. Daniel Leonard, Scientific American, 28 Sep. 2022 Here is a micron-size cube from the wood of an Elm tree. Discover Magazine, 29 June 2010 The resulting delicate strands can reach several feet in length and are about a micron (0.001 millimeters) thick. Jonathan Edwards, Washington Post, 29 Nov. 2022 One of the most promising thin-film technologies involves perovskites, minerals with a crystal structure that can be spread as thin as half a micron, which is smaller than some bacteria. Jackie Snow, WSJ, 13 Nov. 2022 Nanoplastics, a subcategory of microplastics, are even smaller: less than a micron and invisible to the human eye. Ali Francis, Bon Appétit, 5 Oct. 2022 The coronavirus has been found in tiny aerosols — even smaller than 1 micron — that can stay in the air for more than 12 hours. Chronicle Advice Team, San Francisco Chronicle, 4 Aug. 2022 The reverse osmosis filter removes impurities down to 1/10,000 of a micron, reducing arsenic, lead, parasitic cysts, copper and more. Jamie Kim, Good Housekeeping, 3 May 2022 See More

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.

Word History


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 31 Jan. 2023.

Kids Definition


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

Medical Definition


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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