Definition of loop

• n. - A mass of iron in a pasty condition gathered into a ball for the tilt hammer or rolls.
• n. - 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.
• n. - A small, narrow opening; a loophole.
• n. - A curve of any kind in the form of a loop.
• n. - A wire forming part of a main circuit and returning to the point from which it starts.
• n. - The portion of a vibrating string, air column, etc., between two nodes; -- called also ventral segment.
• 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.