noun

• 1A device for passing a thread through the needle and guides of a sewing machine.

  ‘To thread texturized nylon, use a needle threader or put a dab of seam sealant on the thread end and let it dry before threading the needle.’

  More example sentences

  • ‘There's a darning needle, of course, a threader, a hemostat (the instrument doctors use to put in sutures), and an Army survival tool.’

  1. 1.1A factory worker who attaches spools of yarn to a loom.

• 2A device for cutting a spiral ridge on the outside of a screw or the inside of a hole.