Usage Note
Fibra is feminine, plural fibre, and spans textile threads, dietary fibre (fibre alimentari), and high-speed internet (la fibra ottica). Figuratively con tutte le fibre means 'with every fibre of one's being'.
Examples
"Questa stoffa è di fibra naturale."
Natural Translation
This fabric is made of natural fibre.
Literal Translation
This fabric is of fibre natural.

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