neutronium

From neutron +‎ -ium. Coined by scientist Andreas von Antropoff in 1926 (before the discovery of the neutron in 1931; neutrons had been predicted to exist in 1920).

• enPR: no͞o-trōʹnē-əm

• Audio (Southern England):

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neutronium (uncountable)

1. (physics) A material composed entirely of neutrons.
2. (physics) A hypothetical gravitationally bound system of a neutron and an antineutron (the onium of a neutron), not predicted to exist under normal circumstances.

• Sense 1:
  • element 0
  • element zero
  • neutrite
  • neutrium
  • neutron-degenerate matter
  • neutron matter
  • nilium
  • Symbols:
    • n
    • n_n (polyneutron)
    • N (nilium)
    • Nt (neutronium/neutrium) (Can we verify⁽⁺⁾ this sense?)
• Sense 2:
  • neutron-antineutron system
  • true neutronium
  • Symbols:
    • nn

• antielement 0
• antielement zero
• antineutrium
• antineutronium
• antinilium

• Sense 1:
  • degenerate matter
• Sense 2:
  • nucleonium
  • onium

• dineutron
• mononeutrium
• mononeutron
• mononeutronium
• mononilium
• neutron
• polyneutrium
• polyneutron
• polyneutronium
• polynilium
• tetraneutron
• trineutron

• electron-degenerate matter
• proton-degenerate matter
• quark-degenerate matter
• preon-degenerate matter

• neutron-star matter

Internationalism (see English neutronium).

• (Classical Latin) IPA^(key): [nɛu̯ˈtrɔ.ni.ũː]
• (modern Italianate Ecclesiastical) IPA^(key): [neu̯ˈtrɔː.ni.um]

neutronium n (genitive neutroniī); second declension

1. neutronium

Second-declension noun (neuter).