From The Collaborative International Dictionary of English v.0.44 [gcide]:
Bicarbonate \Bi*car"bon*ate\, noun [Pref. bi- + carbonate.] (Chem.) 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}.
From WordNet (r) 2.0 [wn]:
noun
1: a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate [syn: {hydrogen carbonate}]
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