Emily Dickinson Lexicon

LOOP, n. [Ir. lubam, to bend or fold; lub, luba, a thong, loop.]

1. A folding or doubling of a string or a noose, through which a lace or cord may be run for fastening. That the probation bear no hinge, nor loop / To hang a doubt on. – Shak.
2. In iron-works, the part of a row or block of cast iron, melted off for the forge or hammer.