neutronium

== English == === Etymology === 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). === Pronunciation === enPR: no͞o-trōʹnē-əm === Noun === neutronium (uncountable) (physics) A material composed entirely of neutrons. (physics) A hypothetical gravitationally bound system of a neutron and an antineutron (the onium of a neutron), not predicted to exist under normal circumstances. ==== Synonyms ==== Sense 1: element 0 element zero neutrite neutrium neutron-degenerate matter neutron matter nilium Symbols: n nn (polyneutron) N (nilium) Nt (neutronium/neutrium) (Can we verify(+) this sense?) Sense 2: neutron-antineutron system true neutronium Symbols: nn ==== Antonyms ==== antielement 0 antielement zero antineutrium antineutronium antinilium ==== Hypernyms ==== Sense 1: degenerate matter Sense 2: nucleonium onium ==== Hyponyms ==== dineutron mononeutrium mononeutron mononeutronium mononilium neutron polyneutrium polyneutron polyneutronium polynilium tetraneutron trineutron ==== Coordinate terms ==== electron-degenerate matter proton-degenerate matter quark-degenerate matter preon-degenerate matter ==== Derived terms ==== ==== Translations ==== ==== See also ==== neutron-star matter == Latin == === Etymology === Internationalism (see English neutronium). === Pronunciation === (Classical Latin) IPA(key): [nɛu̯ˈtrɔ.ni.ũː] (modern Italianate Ecclesiastical) IPA(key): [neu̯ˈtrɔː.ni.um] === Noun === neutronium n (genitive neutroniī); second declension neutronium ==== Declension ==== Second-declension noun (neuter).