Definition of: fiber

(fī′bər) noun
1. A fine filament.
2. A slender or threadlike component of a substance, as of wood, or spun glass.
3. An individual filament, as of wool or cotton.
4. A structure composed of filaments; especially, any natural or synthetic material that may be separated into threads for spinning, weaving, etc.: the fiber of hemp, flax, rayon, or wool, etc.
5. Bot. a A slender, elongated, and thickened cell in the strengthening tissue of plants, b A filamentous wool; also, a rootlet.
6. The texture of anything.
7. Character; nature; make–up: a woman of strong fiber. Also fi′bre. [<F fibre <L fibra fiber]
—fi′bered adjective
—fi′ber·less adjective