ul·​tra·​fine ˌəl-trə-ˈfīn How to pronounce ultrafine (audio)
: fine to an extreme degree: such as
: extremely small, thin, or precise
ultrafine dust particles
an ultrafine needle
Color "curves," meanwhile, allow ultrafine adjustments and targeting of color and brightness ranges …Alexander Breindel
: of extremely high quality
ultrafine wines

Examples of ultrafine in a Sentence

Recent Examples on the Web What’s most impressive is that it’s made from ultrafine merino wool — a high-quality material that’s soft to the touch — for only $50. Jessie Quinn, Peoplemag, 25 Jan. 2024 The super rich want to resemble people in lower tax brackets in terms of their wardrobe, but with invisibly higher quality garments, often made with more labor intensive techniques or rarer fibers (Brunello knits are made from ultrafine vicuña wool, from llama-like animals that live in the Andes). Rachel Shin, Fortune, 24 July 2023 As a multibillionaire and longtime Cucinelli aficionado, Mr. Benioff would most likely recognize the jacket as being from the Italian designer’s exclusive line of creations rendered in vicuña — a rare, ultrafine wool harvested from llama-like animals in Bolivia. Guy Trebay, New York Times, 22 July 2023 Antimicrobial fibers include ultrafine silver strands woven into the fabric, or a chemical treatment applied during the manufacturing process. Maggie Slepian, Travel + Leisure, 5 Dec. 2023 Remove 99% of ultrafine particles while enjoying crisp music. Gaby Keiderling, Vogue, 10 Oct. 2023 Worse, wildfire smoke also contains even tinier bits called ultrafine particles, which have a diameter less than one-tenth of a micrometer. Ashley Stimpson, Popular Mechanics, 8 June 2023 Others are fine particles (known as PM 2.5, with diameters up to 2.5 microns) and ultrafine particles (known as PM 0.1, with diameters of 100 nanometers), which can enter through our bloodstream and harm our organs. Kasha Patel, Anchorage Daily News, 10 July 2023 After less than two weeks of exposure to high concentrations of particulate matter – in particular, ultrafine particles measuring less than 2.5 microns in diameter, which are known as PM2.5 – captive rhesus macaques suffered a spike in pregnancy loss. Wendy M. Erb, Fortune Well, 25 June 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'ultrafine.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1853, in the meaning defined above

Time Traveler
The first known use of ultrafine was in 1853

Dictionary Entries Near ultrafine

Cite this Entry

“Ultrafine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultrafine. Accessed 29 Feb. 2024.

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