Source : Webster's Revised Unabridged Dictionary (1913)

Furthermore \Fur"ther*more"\, adv.
   or conj. Moreover; besides; in addition to what has been
   said.

Source : WordNet®

furthermore
     adv : in addition; "computer chess games are getting cheaper all
           the time; furthermore, their quality is improving";
           "the cellar was dark; moreover, mice nested there";
           "what is more, there's no sign of a change" [syn: {moreover},
            {what is more}]