a white, crystalline powder, NaCHO·2HO, that dissolves in water but not alcohol, with a salty taste, used as a food additive, esp. in soft drinks, as an anticoagulant, etc.
See sodium citrate in American Heritage Dictionary 4
noun
A white crystalline or granular compound, Na3C6H5O7·2H2O, used in photography and in medicine especially as an anticoagulant of blood stored for transfusion.