Balmer seriesPronunciation: /ˈbɑːmə/Definition of Balmer series noun Physics a series of lines in the visible and ultraviolet spectrum of atomic hydrogen, between 656 and 365 nanometres. Origin:from the name of the Swiss physicist J. J. Balmer (1825–98)Balmer series in other Oxford dictionaries Definition of Balmer series in the US English dictionary