Longman Dictionary of Contemporary English homepage

fibre

noun
     
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
4

nerve/muscle fibres

HBA the thin pieces of flesh that form the nerves or muscles in your body
5

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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