noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   an exotic atom equivalent to a hydrogen atom with the proton replaced by a pion
2. 2
   an onium where the bound antiparticle-particle pair is a pion and an antipion.

Synonyms

All synonyms

pi mu atompi-mu atom

Etymology

From pion + -ium.

Related phrases

exotic atom

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