D defs.my
Entry 1 sense Webster, 1913

Bicarbonate

/bīk-är'-bən-ət/ · Bi·car·bon·ate · IPA /baɪˈkɑɹ.bə.neɪt/
01 n. A carbonate in which but half the hydrogen of the acid is replaced by a positive element or radical, thus making the proportion of the acid…
  1. 1.
    A carbonate in which but half the hydrogen of the acid is replaced by a positive element or radical, thus making the proportion of the acid to the positive or basic portion twice what it is in the normal carbonates; an acid carbonate; -- sometimes called supercarbonate.(Chem.) Also: supercarbonate