Definition of ultra-fine in English:

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ultra-fine

adjective

Extremely fine in size, texture, composition, etc. the ultra-fine particles emitted by diesel vehicles the fiber in merino wool is ultra-fine
More example sentences
  • The line I've been using by the way is 4lb Maxima, which is not ultra-fine diameter.
  • The ultra-fine filter is a boon to brewers who need to remove cloudy yeast residues.
  • An ultra-fine muslin or nylon curtain will do the job perfectly.
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