element zero

English

Alternative forms

Etymology

From being a chemical element with zero protons

Noun

element zero (uncountable)

  1. (informal, nuclear physics, science fiction) Synonym of neutronium; A type of neutron matter, which can be considered as an atomic nucleus with just neutrons.
    Coordinate terms: neutron, free neutron, tetraneutron, neutron star, neutron star matter, neutron-degenerate matter, neutron matter, neutron degeneracy, n
  2. (informal, nuclear chemistry) Synonym of muonium; An exotic atom, an analogue of the hydrogen protium atom, where the the proton is replaced by an antimuon. (muonium is also called hydrogen-0 or the lightest isotope of hydrogen in physical chemistry.)
    Coordinate terms: protium, deuterium, tritium, hydrium, hydrogen-0, hydrogen-1, hydrogen-2, hydrogen-3, hydrogen, muon, anti-muon, muononium, exotic atom, atom, onium, meson
  3. (science fiction) A fictional chemical element with element number/atomic number/proton number zero (0). (This frequently has magical unreal impossible characteristics.)
  4. Used other than figuratively or idiomatically: see element,‎ zero.
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