fiber

US /ˈfaɪ.bɚ/
UK /ˈfaɪ.bɚ/
"fiber" picture
1.

a thread or filament from which a vegetable tissue, mineral substance, or textile is formed

:
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Cotton fibers are used to make fabric.
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The rope was made of strong synthetic fibers.
:
filamentthreadstrand
2.

dietary material containing substances such as cellulose, lignin, and pectin, which are resistant to the action of digestive enzymes

:
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Eating enough fiber is important for digestive health.
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Whole grains are a good source of dietary fiber.
:
roughage