The Collaborative International Dictionary of English v.0.48:

Dulcorate \Dul"co*rate\, v. t. [L. dulcoratus, p. p. of
   dulcorare, fr. dulcor sweetness, fr. dulcis sweet.]
   To sweeten; to make less acrimonious. [R.] --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dulcorate
    v 1: make sweeter in taste [syn: sweeten, dulcify,
         edulcorate, dulcorate] [ant: acetify, acidify,
         acidulate, sour]