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countable and uncountable, plural fibres
(countable) A single piece of a given material, elongated and roughly round in cross-section, often twisted with other fibres to form thread. examples
(uncountable) Material in the form of fibres. examples
Dietary fibre. examples
Moral strength and resolve. quotations examples
He was gentlemanly, steady, tractable, with a thorough knowledge of his duties; and in time, when yet very young, he became chief mate of a fine ship, without ever having been tested by those events of the sea that show in the light of day the inner worth of a man, the edge of his temper, and the fibre of his stuff; that reveal the quality of his resistance and the secret truth of his pretences, not only to others but also to himself.
1900, Joseph Conrad, chapter 2, in Lord Jim
(mathematics) The preimage of a given point in the range of a map. examples
(category theory) Said to be of a morphism over a global element: The pullback of the said morphism along the said global element. examples
(computing) A kind of lightweight thread of execution. examples
(cytology) A long tubular cell found in bodily tissue.