Hydrogen-4

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Synonym of quadrium (“isotope of hydrogen”). uncountable

Synonyms

All synonyms
quadrium

Etymology

So named because it is the isotope of hydrogen that has four nucleons (a proton and three neutrons).

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