neutronium

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

Noun

 * 1)  A material composed entirely of neutrons.
 * 2)  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)
 * Sense 2:
 * neutron-antineutron system
 * true neutronium
 * Symbols:
 * n n

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

Translations

 * French:
 * Italian: neutronio