Source : Webster's Revised Unabridged Dictionary (1913)

Righthanded \Right"*hand`ed\, a.
   1. Using the right hand habitually, or more easily than the
      left.

   2. Having the same direction or course as the movement of the
      hands of a watch seen in front; -- said of the motion of a
      revolving object looked at from a given direction.

   3. (Zo["o]l.) Having the whorls rising from left to right;
      dextral; -- said of spiral shells. See Illust. of
      {Scalaria}.

   {Right-handed screw}, a screw, the threads of which, like
      those of a common wood screw, wind spirally in such a
      direction that the screw advances away from the observer
      when turned with a right-handed movement in a fixed nut.