Fibers or fibres (see spelling differences) are a class of hair-like materials that are continuous filaments or are in discrete elongated pieces, similar to pieces of thread. They can be used as a component of composite materials. They can also be matted into sheets to make products such as paper or felt. Fibers are of two types: natural fiber whi...
Any of the naturally occurring fibers obtained from plants or animals. 
Any textile fiber manufactured from an animal or vegetable source. Cotton, linen, silk and wool are the foremost examples.
[n] - derived from plants or animals
natural fibre noun derived from plants or animals