Source : Webster's Revised Unabridged Dictionary (1913)

Unsolder \Un*sol"der\, v. t. [1st pref. un- + solder.]
   To separate or disunite, as what has been soldered; hence, to
   divide; to sunder. [Formerly written also {unsoder}.]
   --Tennyson.

Source : WordNet®

unsolder
     v : remove the soldering from