Webster's Revised Unabridged Dictionary · 1913

Loop

Loop (lop) , noun

[German luppe an iron lump. Compare Looping.]

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

Loop , noun

[Compare Ir. & Gael. lub loop, noose, fold, thong, bend, lub to bend, incline.]

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. — Shakespeare
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. — Shakespeare
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.
Collocations (1)
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 (lop) , transitive verb

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.