Definition of noil in US English:

noil

noun

usually noils
  • Short strands and knots combed out of wool fiber before spinning.

    • ‘These bits of wool, second cuts, or noils must be carded out or they make slubs in the finished yarn.’
    • ‘The shortwool noils are generally used in producing plain and fancy woolens or soft fabrics.’
    • ‘The short wool or noil, which is removed from the long fiber, is left in the small circles and from there removed by noil knives, falling as waste under the comb.’

Origin

Early 17th century: probably from Old French noel, from medieval Latin nodellus, diminutive of Latin nodus ‘knot’.

Pronunciation

noil

/noil//nɔɪl/