1. a thread-like structure or filament, especially one found in plant or animal tissue
2. dietary material containing substances such as cellulose that are resistant to the action of digestive enzymes
3. a thin thread of natural or artificial material that can be spun into yarn

Examples

• Cotton fiber is used to make soft clothing.
• The doctor recommended eating more fiber to improve digestion.
• Synthetic fibers like polyester are common in modern fabrics.
• She showed great moral fiber during the crisis.
• Fiber optic cables carry internet signals at the speed of light.
• Muscle fibers contract to produce movement.
• The carpet is made from natural wool fibers.