loopn.[G. luppe an iron lump. Cf. Looping.] (Iron Works) A mass of iron in a pasty condition gathered into a ball for the tilt hammer or rolls.()n.[Cf. 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. (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.()v. t. 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.()