tvívetni

== Icelandic == === Etymology === From tví- (“two, double, binary”) +‎ vetni (“hydrogen”). === Pronunciation === IPA(key): /ˈtʰviːvɛhtnɪ/ === Noun === tvívetni n (genitive singular tvívetnis, no plural) (physics, symbol D or 21H) deuterium Synonyms: þungt vetni, þungavetni ==== Declension ==== ==== Hypernyms ==== vetni (“hydrogen”) ==== Coordinate terms ==== (isotopes of hydrogen) protium: einvetni (also called prótín) tritium: þrívetni (also called ofurþungt vetni) ==== Derived terms ==== ==== See also ==== þungt vatn