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New American Oxford Dictionary

protium

pro ti um |ˈprōtēəm, ˈprōSH (ē )əm ˈproʊdiəm | noun Chemistry the common, stable isotope of hydrogen, as distinct from deuterium and tritium. ORIGIN 1930s: modern Latin, from Greek prōtos first.

 

Oxford Dictionary

protium

protium |ˈprəʊtɪəm | noun [ mass noun ] Chemistry the common, stable isotope of hydrogen, as distinct from deuterium and tritium. ORIGIN 1930s: modern Latin, from Greek prōtos first .

 

Duden Dictionary

Protium

Pro ti um Substantiv, Neutrum , das |Pr o tium |das Protium; Genitiv: des Protiums griechisch-neulateinisch leichter Wasserstoff, Wasserstoffisotop; vgl. Isotop