Usually means: Extremely low density; like gas.
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We found 6 dictionaries that define the word ultragaseous:

General (6 matching dictionaries)
  1. ultragaseous: Merriam-Webster
  2. ultragaseous: Wordnik
  3. ultragaseous: Wiktionary
  4. Ultragaseous: Dictionary.com
  5. ultragaseous: FreeDictionary.org
  6. Ultragaseous: TheFreeDictionary.com

Definitions from Wiktionary (ultragaseous)

adjective:  Having the properties exhibited by gases under very low pressures (one millionth of an atmosphere or less).

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