noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Synonym of muonium. uncountable

Synonyms

All synonyms

muonium

Etymology

So called because its atomic mass is about 0.1 dalton, which is zero if rounded to the nearest whole number.

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