Answer: oxalate

AnswerCrossword Clue
OXALATESalt of an acid.
OXALATEPrevent coagulation
OXALATEChemical salt in spinach and parsley
oxalateto treat with a chemical salt
oxalatea salt or ester of oxalic acid
oxalateany salt or ester of oxalic acid, occurring in plants, esp. spinach, rhubarb, and certain other vegetables and nuts, and capable of forming an insoluble salt with calcium and interfering with its absorption by the body