Usually means: Extremely small, minute particle size.
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We found 6 dictionaries that define the word ultrafine:

General (5 matching dictionaries)
  1. ultrafine: Merriam-Webster
  2. ultrafine: Collins English Dictionary
  3. ultrafine: Wordnik
  4. ultrafine: Wiktionary
  5. ultrafine: TheFreeDictionary.com

Tech (1 matching dictionary)
  1. Schlumberger Oilfield Glossary (No longer online)

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Definitions from Wiktionary (ultrafine)

▸ adjective:  (of particles) Very fine

Similar:
microfine, hyperfine, ultrasmall, ultrafaint, ultratiny, ultraminute, ultramicroporous, microthin, ultramicro, nanothin, more...

Opposite:
coarse, rough, gritty, grainy

Phrases:
ultrafine particles, ultrafine particle, more...

▸ Words similar to ultrafine

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▸ Popular nouns described by ultrafine

▸ Words that often appear near ultrafine

▸ Rhymes of ultrafine

▸ Invented words related to ultrafine

Similar:
microfine, hyperfine, ultrasmall, ultrafaint, ultratiny, ultraminute, ultramicroporous, microthin, ultramicro, nanothin, more...

Opposite:
coarse, rough, gritty, grainy

Phrases:
ultrafine particles, ultrafine particle, more...



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