Source : Webster's Revised Unabridged Dictionary (1913)

Unthread \Un*thread"\, v. t. [1st pref. un- + thread.]
   1. To draw or take out a thread from; as, to unthread a
      needle.

   2. To deprive of ligaments; to loose the ligaments of.

            He with his bare wand can unthread thy joints.
                                                  --Milton.

   3. To make one's way through; to traverse; as, to unthread a
      devious path. --De Quincey.