hydrogenum

== Latin == === Pronunciation === (Classical Latin) IPA(key): [hyˈdrɔ.ɡɛ.nũː] (modern Italianate Ecclesiastical) IPA(key): [iˈdrɔː.d͡ʒe.num] === Noun === hydrogenum n (genitive hydrogenī); second declension (New Latin, chemistry) alternative form of hydrogenium ==== Declension ==== Second-declension noun (neuter).