ultrafine

adjective
ul·​tra·​fine | \ ˌəl-trə-ˈfīn How to pronounce ultrafine (audio) \

Definition of ultrafine

: fine to an extreme degree: such as
a : 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
b : of extremely high quality ultrafine wines

First Known Use of ultrafine

1853, in the meaning defined above

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The first known use of ultrafine was in 1853

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