Fibre n. : One of the delicate, threadlike portions of which the tissues of plants and animals are in part constituted; as, the fiber of flax or of muscle.

Fibre n. : Any fine, slender thread, or threadlike substance; as, a fiber of spun glass; especially, one of the slender rootlets of a plant.

Fibre n. : Sinew; strength; toughness; as, a man of real fiber.

Fibre n. : A general name for the raw material, such as cotton, flax, hemp, etc., used in textile manufactures.

fibre : A tough vegetable fiber used as a substitute for bristles in making brushes. The piassava and the ixtle are both used under this name.

Example:
Best ways to get more fibre into my diet?

Taxonomy
fibers, Natural fibers, cellulose, man-made fibers, synthetic fibers, Microfibers, Cellulose fibers, free encyclopedia, natural cellulose, Mineral fibers, aluminum, polyester, textiles, Carbon fibers, component, aspect ratio, fibre, Textile fiber.

Defination from the web:
fibers are diverse. ... Fibers are often used in the manufacture of other materials. ... Animal fibers consist largely of particular proteins. ...