Ultravacuum Definition
    noun
  
 A near-perfect vacuum; i.e. an almost or fully complete absence of matter, especially a gas at very low pressure.
Wiktionary 
Other Word Forms of Ultravacuum
Noun
Singular:
 ultravacuumPlural:
 ultravacuumsOrigin of Ultravacuum
-  ultra- + vacuum From Wiktionary 
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