fibre

noun

1. A single piece of a given material, elongated and roughly round in cross-section, often twisted with other fibres to form thread.“The microscope showed several different fibres stuck to the sole of the shoe.”
2. Material in the form of fibres.“The cloth was made from strange, somewhat rough fibre.”
3. Dietary fibre.“Fresh vegetables are a good source of fibre.”
4. Moral strength and resolve.“The ordeal was a test of everyone’s fibre.”