dideuterium

== English == === Noun === dideuterium (uncountable) A molecule composed of two deuterium atoms, or matter composed of such molecules. Symbol: 2H2 or D2. ==== Usage notes ==== The chemical symbol for deuterium should be 2H, rather than D; to prevent problems in alphabetical sorting of formulae. Likewise, tritium should be called 3H, rather than T. ==== Synonyms ==== deuterium dimer diatomic deuterium ==== Hypernyms ==== dihydrogen ==== See also ==== allotrope diprotium ditritium isotopologue trideuterium === References ===