fiber

noun

1. A single elongated piece of a given material, roughly round in cross-section, often twisted with other fibers to form thread.“The microscope showed a single blue fiber stuck to the sole of the shoe.”
2. A material in the form of fibers.“The cloth is made from strange, somewhat rough fiber.”
3. A material whose length is at least 1000 times its width.“Please use polyester fiber for this shirt.”
4. Dietary fiber.“Fresh vegetables are a good source of fiber”