n
[U]
the parts of plants that you eat but cannot digest. Fibre helps to keep you healthy by moving food quickly through your body
　Fruit and vegetables are high in fibre content .
　food that is high in dietary fibre
[U and C]
a mass of threads used to make rope, cloth etc
natural/synthetic/man-made etc fibre
　Nylon is a man-made fibre.
[C]
a thin thread, or one of the thin parts like threads that form natural materials such as wood or carbon
nerve/muscle fibres
the thin pieces of flesh that form the nerves or muscles in your body
with every fibre of your being
literary if you feel something with every fibre of your being, you feel it very strongly
　He wanted her with every fibre of his being.
→moral fibreatmoral¹ (2), optical fibre