Source : Webster's Revised Unabridged Dictionary (1913)

Tagger \Tag"ger\, n.
   1. One who, or that which, appends or joins one thing to
      another.

   2. That which is pointed like a tag.

            Hedgehogs' or procupines' small taggers. --Cotton.

   3. pl. Sheets of tin or other plate which run below the
      gauge. --Knight.

   4. A device for removing taglocks from sheep. --Knight.