Bicarbonate
Pronunciation : Bi*car"bon*ate
Part of Speech : n.
Etymology : [Pref. bi-+ carbonate.] (Chem.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913