bicarbonatePronunciation: /bʌɪˈkɑːbəneɪt, -nət/Translate bicarbonate | into Italian Definition of bicarbonate noun 1 Chemistry a salt containing the anion HCO3−. 2 (also bicarbonate of soda) [mass noun] sodium bicarbonate. bicarbonate in other Oxford dictionaries Definition of bicarbonate in the US English dictionary