Usually means: Extremely thin, nearly microscopic thickness.
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We found 9 dictionaries that define the word ultrathin:

General (8 matching dictionaries)
  1. ultrathin: Merriam-Webster
  2. ultrathin: American Heritage Dictionary of the English Language
  3. ultrathin: Collins English Dictionary
  4. Ultrathin, ultrathin: Wordnik
  5. ultrathin: Wiktionary
  6. ultrathin: Infoplease Dictionary
  7. ultrathin: Dictionary.com
  8. ultrathin: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. ultrathin: Merriam-Webster Medical Dictionary

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Definitions from Wiktionary (ultrathin)

▸ adjective:  Extremely thin; of utmost thinness.

Similar:
razor-thin, razor thin, ultralight, wafer-thin, ultralightweight, ultrasparse, ultrasilent, ultraminimal, superlightweight, superlight, more...

Opposite:
ultrathick, bulky, hefty, substantial, chunky

Phrases:
ultrathin section, more...

▸ Words similar to ultrathin

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▸ Rhymes of ultrathin

▸ Invented words related to ultrathin

Similar:
razor-thin, razor thin, ultralight, wafer-thin, ultralightweight, ultrasparse, ultrasilent, ultraminimal, superlightweight, superlight, more...

Opposite:
ultrathick, bulky, hefty, substantial, chunky

Phrases:
ultrathin section, more...



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