Fiber or fibre is a natural or man-made substance that is significantly longer than it is wide. Fibers are often used in the manufacture of other materials. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.

What is the simple definition of fiber?

Fiber: The parts of fruits and vegetables that cannot be digested. Fiber is of vital importance to digestion; it helps the body move food through the digestive tract, reduces serum cholesterol, and contributes to disease protection. Also known as bulk and roughage.

What does fibre mean in biology?

Definition. noun, plural: fibres. (1) (anatomy) Any elongated, thread-like structure, e.g. nerve fiber and muscle fiber. (2) (botany) A narrow, elongated, and thick-walledcell in sclerenchyma tissues.