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1530s, from French fibre (14c.), from Latin fibra "a fiber, filament," of uncertain origin, perhaps related to Latin filum "thread," or from root of findere "to split." Fiberboard is from 1897; Fiberglas is 1937, U.S. registered trademark name; and fiber optics is from 1956.
fiber fi·ber (fī'bər)
A slender thread or filament.
Extracellular filamentous structures such as collagenic or elastic connective tissue fibers.
The nerve cell axon with its glial envelope.
An elongated threadlike cell, such as a muscle cell or one of the epithelial cells of the lens of the eye.
Coarse, indigestible plant matter, consisting primarily of polysaccharides such as cellulose, that when eaten stimulates intestinal peristalsis. Also called roughage.