Lewis Short
ob-dulco, 1
* V. a., to sweeten, make sweet (post-class.): aliquid sale,Cael. Aur. Tard. 3, 8, 146; 4, 1, 12: fauces, Ambros. Hexaëm. 5, 12: obdulcatus panis,Cael. Aur. Tard. 3, 8 med.: fontes amari obdulcati,Vulg. Judith, 5, 15.
Charlton T. Lewis, Charles Short, A Latin Dictionary