Source : Webster's Revised Unabridged Dictionary (1913)

Overhand \O"ver*hand`\, a.
   1. (Sewing) Over and over; -- applied to a style of sewing,
      or to a seam, in which two edges, usually selvedges, are
      sewed together by passing each stitch over both.

   2. (Baseball, Cricket, etc.) Done (as pitching or bowling)
      with the hand higher than the elbow, or the arm above, or
      higher than, the shoulder.

   {Overhand knot}. See Illustration of {Knot}.

Source : WordNet®

overhand knot
     n : a simple small knot (often used as part of other knots)