fi‧bre British English ; fiber American English
1 [uncountable]DFN 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
2 [uncountable and countable]TIM a mass of threads used to make rope, cloth etc
natural/synthetic/man-made etc fibre
Nylon is a man-made fibre.
3 [countable] a thin thread, or one of the thin parts like threads that form natural materials such as wood or carbon

nerve/muscle fibres

HBA 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.

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