trihydrogen

== English == === Etymology === From tri- +‎ hydrogen. === Noun === trihydrogen (countable and uncountable, plural trihydrogens) A cation triangular molecule composed of three hydrogen atoms, or matter composed of such molecules. Symbol: H3+. ==== Synonyms ==== ==== Hyponyms ==== ==== Coordinate terms ==== ==== Derived terms ==== ==== Related terms ====