- a tartrate in which only one of the two acidic hydrogen atoms of tartaric acid is replaced by a metal or positive group; an acid tartrate; a hydrogen tartrate, as sodium bitartrate.
- (not in technical usage) a salt or ester of tartaric acid containing the monovalent group -HC 4 H 4 O 6 or the ion HC 4 H 4 O 6 –
