Source : Webster's Revised Unabridged Dictionary (1913)

Hemstitch \Hem"stitch\, v. t. [imp. & p. p. {Hemstitched}; p.
   pr. & vb. n. {Hemstitching}.] [Hem + stitch.]
   To ornament at the head of a broad hem by drawing out a few
   parallel threads, and fastening the cross threads in
   successive small clusters; as, to hemstitch a handkerchief.

Source : WordNet®

hemstitching
     n : stitch in which parallel threads are drawn and exposed
         threads are caught together in groups [syn: {hemstitch}]