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.
- A slender, elongated, threadlike object or structure.
- Botany One of the elongated, thick-walled cells that give strength and support to plant tissue.
- Anatomy Any of the filaments constituting the extracellular matrix of connective tissue.
- Anatomy Any of various elongated cells or threadlike structures, especially a muscle fiber or a nerve fiber.
- A natural or synthetic filament, as of cotton or nylon, capable of being spun into yarn.
- Material made of such filaments.
- Something that provides substance or texture.
- Essential character: "stirred the deeper fibers of my nature” ( Oscar Wilde).
- Basic strength or toughness; fortitude: lacking in moral fiber.
- Coarse, indigestible plant matter, consisting primarily of polysaccharides such as cellulose, that when eaten stimulates intestinal peristalsis. Also called bulk, roughage.