What is the meaning of Fibra?

fiber, fibre (clarification of this definition is needed)

fiber, fibre (all senses)

fibre, filament

fibre (single elongated piece of material)

definite nominative/accusative singular of fibră

fiber (a single elongated piece of material)

fiber (a material (especially synthetic) in the form of fibers)

fiber; dietary fiber

fiberglass

Source: wiktionary.org