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Ultragaseous
Ultragaseous Ul`tra*gas"e*ous, a. [Pref. ultra + gaseous.]
(Physics)
Having the properties exhibited by gases under very low
pressures (one millionth of an atmosphere or less). Matter
under this condition, which has been termed the fourth state
of matter, is sometimes called radiant matter.
Meaning of Ultragaseous from wikipedia
