Origin: Latin suffix -ate
Bicarbonate has 2 different meanings across 1 category:
a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate
the univalent anion HCO₃⁻; any salt of carbonic acid in which only one of the hydrogen atoms has been replaced.
The word bicarbonate comes from combining the prefix bi- with carbonate. It originally meant a salt containing two parts of carbonic acid.