Loop /(lo͡op)/

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

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.

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.

3. A curve of any kind in the form of a loop.
4. A wire forming part of a main circuit and returning to the point from which it starts. (Telegraphy)
5. The portion of a vibrating string, air column, etc., between two nodes; -- called also ventral segment. (Acoustics)

imp. & p. p. Looped; p. pr. & vb. n. Looping

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.