Word.ws English Dictionary

ultravacuum

ultravacuum noun: a nearly perfect vacuum; i.e. an almost or fully complete absence of matter, especially a gas at very low pressure.

Noun

ultravacuum (plural ultravacuums or ultravacua)

  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...1946, The Paper Industry and Paper World, Volume 28, Issue 6, Paper Industry Management Association, page 814
    • These lines are so-called “‘forbidden”’ lines which, in the crowded conditions even in a laboratory vacuum, would not appear; in the ultravacuum of a nebula, the atoms have no choice but to emit the forbidden energy.1951, Roy K. Marshall, The Nature of Things, Henry Holt and Company, page 173

Examples of ultravacuum in a sentence

  • The mechanics of these latter gauges seriously limit their use to the continuous measurement of high and ultravacuums.1946, The Paper Industry and Paper World, Volume 28, Issue 6, Paper Industry Management Association, page 814:
  • Some experiments which require the achievement of exceedingly antiseptic vacuum conditions have had to be preceded by intense research into the general problems of ultravacuums and surface physics.1959, Annual Review of Nuclear Science, Palo Alto, Calif. Annual Reviews, pages 368-369:
  • Bursts of gas have been observed when a crystal is cleaved under ultravacuum conditions (117).1964, American Chemical Society Division of Industrial and Engineering Chemistry, Industrial and Engineering Chemistry, Symposium on...
  • Then there are problems of measuring what goes on in an ultravacuum.1965, Analog - Science Fiction, Science Fact, Trader Team, page 78:

Forms of ultravacuum

pluralultravacuums
pluralultravacua

Origin of ultravacuum

From ultra- + vacuum.

Questions about ultravacuum

What does ultravacuum mean?
Ultravacuum means a nearly perfect vacuum; i.e. an almost or fully complete absence of matter, especially a gas at very low pressure.
How do you use ultravacuum in a sentence?
The mechanics of these latter gauges seriously limit their use to the continuous measurement of high and ultravacuums.
What part of speech is ultravacuum?
Ultravacuum is a noun.
What is the plural of ultravacuum?
The plural of ultravacuum is ultravacuums.

Words near ultravacuum in the dictionary

  1. ultratropical
  2. ultratypical
  3. ultratyrannical
  4. ultraurgent
  5. ultravacua
  6. ultravacuum
  7. ultravacuums
  8. ultravast
  9. ultravicious
  10. ultravigilant
  11. ultravillain

Source and license

Adapted from Wiktionary: ultravacuum (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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