noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The antimatter equivalent of hydrogen, consisting of an antiproton and a positron (antielectron). particle, uncountable, usually
2. 2
   An atom of the antimatter equivalent of hydrogen. countable, particle, usually

Etymology

From anti- + hydrogen.

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