noun Chemistry.

  1. a salt of carbonic acid, containing the HCO3−1 group; an acid carbonate, as sodium bicarbonate, NaHCO3.


  1. a salt of carbonic acid containing the ion HCO 3 –; an acid carbonate
  2. (modifier) consisting of, containing, or concerned with the ion HCO 3 –a bicarbonate compound Systematic name: hydrogen carbonate
  3. short for bicarbonate of soda

1819, from bi- + carbonate.


  1. The radical group HCO3 or a compound, such as sodium bicarbonate, containing it.

  1. The group HCO3 or a compound containing it, such as sodium bicarbonate. When heated, bicarbonates give off carbon dioxide.
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