Loop, n.
 1. A fold or doubling of a thread, cord, rope, etc., through which another thread, cord, etc., can be passed, or which a hook can be hooked into; an eye, as of metal; a staple; a noose; a bight.
 That the probation bear no hinge, nor loop
 To hang a doubt on.   --Shak.
 2. A small, narrow opening; a loophole.
 And stop all sight-holes, every loop from whence
 The eye of Reason may pry in upon us.   --Shak.
 3. A curve of any kind in the form of a loop.
 4. Telegraphy A wire forming part of a main circuit and returning to the point from which it starts.
 5. Acoustics The portion of a vibrating string, air column, etc., between two nodes; -- called also ventral segment.
 Loop knot, a single knot tied in a doubled cord, etc. so as to leave a loop beyond the knot. See Illust. of Knot.


 loop knot
      n : any of various knots used to make a fixed loop in a rope