Ultravacuum
noun ·Rare ·Advanced level
Definitions
- 1 A nearly perfect vacuum; i.e. an almost or fully complete absence of matter, especially a gas at very low pressure.
"The operating principles employed in the thermal and ionization gauges are to be contrasted with the mercury manometer and Bourdon tube type vacuum gauges which have been used for years. The mechanics of these latter gauges seriously limit their use to the continuous measurement of high and ultravacuums."
Example
More examples"The operating principles employed in the thermal and ionization gauges are to be contrasted with the mercury manometer and Bourdon tube type vacuum gauges which have been used for years. The mechanics of these latter gauges seriously limit their use to the continuous measurement of high and ultravacuums."
Etymology
From ultra- + vacuum.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.