Lewis & Short

dulcōro, āre, 1, v. a. [dulcor], to sweeten (late Lat.): amaritudinem, Hier. Ep. 22, 9; id. ib. 69, 9: animam, Vulg. Prov. 27, 9: mare mortuum et amaras aquas, Hier. ap. Psa. 76.
Hence, P. a.: dulcōrātus, a, um, sweetened, Plin. Val. 1, 2 al.