noun ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   Any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families.
2. 2
   The bound pair of a particle and its antiparticle.
3. 3
   Any organic derivative of these compounds.

Etymology

Etymology 1

From English ammonium.

Etymology 2

See Wikipedia at muonium § Nomenclature.

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