Trihydrogen

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
A cation triangular molecule composed of three hydrogen atoms, or matter composed of such molecules. Symbol: H₃⁺. countable, uncountable

Synonyms

hydrogen trimer hydrogenonium protonated molecular hydrogen triatomic hydrogen

Etymology

From tri- + hydrogen.

Related phrases

trihydrogen diphosphate trihydrogen oxide trihydrogen tetrafluoride

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