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Glite Dictionary
positronium

positronium

1 9.9
A short-lived atom-like particle made of an electron and a particle like an electron but with positive charge
  • noun
  • /ˌpɒzɪˈtroʊniəm/
  • Specialized
: positronio
  • When positronium decays, it produces gamma rays that can be detected in particle physics experiments.

Examples

  • The system would resemble positronium, they argued, because asymptotic freedom renders the strong force between the heavy quarks Coulomb-like at distances appropriate to heavy-quark bound states.

    Academic text (2004)

  • In experiments, researchers observed positronium as it formed between an electron and a positron.

  • Same situation, positronium, but now at low magnetic fields.

  • A last-minute rally by the forces of organization can then lead to the formation of positronium atoms, which consist of electrons and positrons in orbit about each other.

    Academic text (2000)

  • The scientist explained that positronium is an unstable atom-like system composed of an electron and its antiparticle, the positron.

Surface Forms

positronium singular
positroniums plural

Morphology

positronium = positron (transparent) = positron + ium

Formed by the scientific suffix '-ium' added to 'positron', so the meaning (an atom-like system related to a positron) follows directly from the base.

Etymology

Positronium comes from positron (a 'positive' electron) plus the ending -ium you see in atom names like helium, so the word tells you it is an 'atom-like' thing made of a positron and an electron. That's why positronium refers to the short-lived, unstable system where an electron and a positron are bound together.