Loop

1. A mass of iron in a pasty condition gathered into a ball for the tilt hammer or rolls.
   

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.
2. A small, narrow opening; a loophole.
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.

1. To make a loop of or in; to fasten with a loop or loops; -- often with up; as, to loop a string; to loop up a curtain.