positronium

noun

positronium

noun

US /ˌpɒzɪˈtɹɒniəm/

Etymology From positr(on) + -onium.

Chemistry, Natural sciences, Physical sciences, Physics An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus.

Derived terms: dipositronium, orthopositronium, parapositronium, positronium hydride
Related terms: muonium, muononium, tauonium, toponium, pionium

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.