Positronium

//ˌpɒzɪˈtɹɒniəm// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus.

Etymology

From positron + -ium.

Related phrases

positronium hydrideanti electronexotic atom

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.